When Paul Calls Christ the hilasterion and John Calls Him the hilasmos — Propitiation, Expiation, or Both?¶
Question¶
When Paul calls Christ the hilasterion (Rom 3:25) and John calls him the hilasmos (1 John 2:2, 4:10), are they describing propitiation (turning away God's wrath), expiation (removing sin's defilement), or both — and what does the Hebrew kapporeth background require?
Summary Answer¶
Paul and John are describing both propitiation and expiation, because the Hebrew concept behind both Greek words — kaphar — inherently encompasses what Greek and English theology tries to separate. The Hebrew verb kaphar maps to three distinct Greek domains in the LXX: hilaskomai (propitiation), aphiemi (forgiveness), and katharizo (purification). The propitiation-versus-expiation debate is partly an artifact of Greek semantic distinctions absent from the Hebrew original. The kapporeth (mercy seat) background requires holding both together: the Day of Atonement ritual at the kapporeth uses exclusively purification vocabulary, yet the background condition — a lethal divine presence ("that he die not," Lev 16:2) — presupposes that the unaddressed problem is fatal. Removing defilement IS what turns away the danger.
Key Verses¶
Romans 3:25 "Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;"
1 John 2:2 "And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world."
1 John 4:10 "Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins."
Hebrews 2:17 "Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people."
Romans 5:9 "Much more then, being now justified by his blood, we shall be saved from wrath through him."
Leviticus 16:30 "For on that day shall the priest make an atonement for you, to cleanse you, that ye may be clean from all your sins before the LORD."
Numbers 16:46-47 "And Moses said unto Aaron, Take a censer, and put fire therein from off the altar, and put on incense, and go quickly unto the congregation, and make an atonement for them: for there is wrath gone out from the LORD; the plague is begun. And Aaron took as Moses commanded, and ran into the midst of the congregation; and, behold, the plague was begun among the people: and he put on incense, and made an atonement for the people."
Psalm 78:38 "But he, being full of compassion, forgave their iniquity, and destroyed them not: yea, many a time turned he his anger away, and did not stir up all his wrath."
Leviticus 17:11 "For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul."
Exodus 12:13 "And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt."
Analysis¶
The Hebrew Starting Point: kaphar Refuses to Choose¶
The foundation of this question lies not in Greek but in Hebrew. The verb kaphar (H3722, approximately 102 OT occurrences, canonical word study H3722-kaphar.md) is the root behind the entire atonement vocabulary. When the LXX translators rendered kaphar into Greek, they were forced to choose among terms that the Hebrew did not distinguish. kaphar maps to hilaskomai (propitiation, PMI 6.47 — 4 co-occurrences), aphiemi (forgiveness, PMI 5.55 — 14 co-occurrences), and katharizo (purification, PMI 5.18 — 14 co-occurrences). Three Greek semantic domains, one Hebrew verb.
This mapping is not a minor philological detail — it is the key to the entire debate. When scholars argue that hilasterion in Rom 3:25 means "propitiation" (turning away wrath) rather than "expiation" (removing defilement), or vice versa, they are importing a Greek distinction back into a concept that the Hebrew source language does not make. kaphar can mean "atone through sacrifice" (Lev 1:4; 4:20; 16:16; 17:11), "purge/remove sin" (Isa 6:7; 22:14; 27:9), "appease/pacify" (Gen 32:20; Prov 16:14), or "forgive" (Psa 78:38; 79:9; Deut 32:43). The KJV translation distribution shows the same breadth: "make atonement" (72%), "purge" (8%), "reconcile" (7%), "forgive/mercy/pardon" (5%), "appease/pacify" (3%), "cleanse" (2%).
Psalm 78:38 brings this into sharpest focus. In a single verse, kaphar (Piel imperfect) appears alongside both aph (anger) and chemah (fury): "he kaphar-ed their iniquity AND turned away his anger AND did not stir up all his fury." The verb simultaneously covers forgiveness of iniquity (expiation — the sin is addressed), turning away anger (propitiation — the wrath is averted), and restraining fury (propitiation — the judgment is withheld). No one Hebrew word does only one of these things. kaphar bridges them all.
The Day of Atonement: Purification Without Wrath Vocabulary¶
The Day of Atonement ritual in Leviticus 16 is the primary OT institution behind the NT hilasterion/hilasmos language, since the kapporeth (mercy seat) is the physical object that the LXX renders as hilasterion (16 times, PMI 9.75, canonical word study TR-kapporeth-hilasterion.md). The vocabulary of Leviticus 16 is revealing: kaphar appears 16 times, taher (cleanse) in vv. 19 and 30, tumah (uncleanness) 5 times, and chattaah (sin/sin offering) 13 times. The chapter's vocabulary is exclusively purification and defilement language.
What is absent is equally significant. Not a single wrath term — aph, chemah, qetseph, or any other — appears in Leviticus 16. The closest the chapter comes to a wrath concept is the warning that Aaron must follow the prescribed ritual "that he die not: for I will appear in the cloud upon the mercy seat" (Lev 16:2). This is not anger language; it is holiness language. God's presence is inherently lethal to the unclean — not because God is angry but because holiness and defilement are incompatible realities.
The Hebrew parsing of Lev 16:16 confirms the expiation orientation. The priest makes atonement "for the holy place" (al haqqodesh) — the sanctuary is the direct object being cleansed, not God being placated. The preposition min ("from") with tumot ("uncleannesses") indicates removal: atonement removes the defilement that has accumulated in the sanctuary because of Israel's sins. The people contaminate the holy space by their uncleanness; the blood purges that contamination so God can continue to dwell among them. Verse 30 makes this explicit: "on that day shall the priest make an atonement for you, to cleanse you, that ye may be clean from all your sins before the LORD."
The DOA's purification vocabulary matters enormously because this is the ritual that defines the kapporeth's function. The kapporeth is where the blood of the sin offering is sprinkled (Lev 16:14-15). It is the meeting point between God's presence and human sin (Exo 25:22; Lev 16:2). When Paul calls Christ the hilasterion (Rom 3:25), he is invoking this entire liturgical complex. And that complex, in its original Hebrew context, is framed as purification, not as wrath-turning.
Wrath and Atonement Outside the Day of Atonement¶
Yet the DOA is not the only context where kaphar appears. Outside Leviticus 16, several passages explicitly connect kaphar with wrath-aversion — and these cannot be dismissed.
Numbers 16:46-48 is the clearest case. Moses commands Aaron: "Take a censer... and make an atonement for them: for there is wrath (qetseph) gone out from the LORD; the plague is begun." Aaron runs into the midst of the dying congregation, puts on incense, "and made an atonement for the people. And he stood between the dead and the living; and the plague was stayed." The sequence is unmistakable: divine wrath → destructive plague → atonement (kaphar) by incense → plague stopped. This is propitiation by ritual act. The incense does not "purify" the people from defilement — it stops the outpouring of divine wrath. kaphar here means to avert God's active judgment.
Numbers 25:1-13 provides a parallel case. "The anger of the LORD was kindled against Israel" (25:3). Phinehas kills the offending couple, and God says he "hath turned my wrath away from the children of Israel, while he was zealous for my sake among them" (25:11). Verse 13 identifies Phinehas's act as atonement: "he was zealous for his God, and made an atonement (kaphar) for the children of Israel." This is propitiation through zealous action — no purification, no cleansing, no ritual washing. The offense is removed by judgment against the offender, and this removal of the offense is called kaphar.
Exodus 12:12-13 adds the Passover typology. "When I see the blood, I will pass over you, and the plague shall not be upon you to destroy you." The Passover blood does not cleanse or purify the houses of Israel — it shields them from destructive divine judgment. This is pure wrath-aversion through blood. Paul identifies Christ as "our passover" (1 Cor 5:7), and Rom 3:25 specifies that the hilasterion is effective "through faith in his blood." The Passover blood typology feeds directly into the hilasterion concept.
These passages demonstrate that biblical atonement (kaphar) is not limited to the purification function of the DOA. It also includes the wrath-averting function seen in Num 16, Num 25, and the Passover. Both dimensions are genuine, both use the same verb, and both contribute to the NT concept of propitiation/expiation.
Romans 3:25 in Its Wrath Context¶
Paul's use of hilasterion in Rom 3:25 does not occur in a vacuum. It sits at the resolution point of a sustained argument about divine wrath that begins in Rom 1:18 and runs through 3:20.
The opening salvo is Rom 1:18: "the wrath of God (orge theou) is revealed from heaven against all ungodliness and unrighteousness of men." This wrath is present tense — actively being revealed — and takes the form of judicial abandonment: "God gave them up" appears three times (1:24, 26, 28). Romans 2:5 intensifies the picture: "after thy hardness and impenitent heart treasurest up unto thyself wrath (orge) against the day of wrath." Wrath is accumulating. Romans 2:8 pairs both Greek wrath terms: thymos kai orge (passionate fury AND judicial displeasure). Romans 3:5 asks: "Is God unrighteous who taketh vengeance (orge)?"
Against this background of wrath — three full chapters of it — Paul introduces the hilasterion. "Whom God hath set forth to be a hilasterion through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God" (Rom 3:25). The hilasterion is the answer to a problem that explicitly includes divine wrath. The literary structure demands that the hilasterion address the wrath: Paul would not spend three chapters establishing a problem and then offer a solution that does not resolve it.
The Greek parsing confirms this reading. hilasterion in Rom 3:25 is anarthrous (without the article), emphasizing Christ's function or quality as a propitiatory — not identifying him with the physical mercy seat (which Heb 9:5 designates with the article: to hilasterion). God "set forth publicly" (proetheto, aorist middle of protithemi) Christ in this propitiatory capacity. The purpose is "to declare his righteousness" (eis endeixin tes dikaiosynes autou) — the hilasterion vindicates God's character, demonstrating that God's prior forbearance (paresis, a hapax distinct from aphesis/forgiveness, meaning "passing over" rather than "remission") was not indifference to sin but patience until the proper remedy arrived.
Romans 3:26 completes the thought: "that he might be just, AND the justifier of him which believeth in Jesus." The dual-purpose construction (dikaion kai dikaionta) shows that the hilasterion resolves a tension within God's own character: how can God maintain his justice (which demands punishment for sin) while simultaneously justifying sinners (which means pardoning them)? The hilasterion is the answer — it provides the ground on which God can do both without contradiction.
Romans 5:9 then makes the blood-wrath connection fully explicit: "Much more then, being now justified by his blood, we shall be saved from wrath (orge) through him." The sequence is: justified BY blood (past, aorist participle) → saved FROM wrath (future, future passive). The blood that justifies is the same blood that delivers from wrath. This verse is the strongest single NT text for a propitiation reading of Christ's blood ministry.
1 John: hilasmos in a Purification Context¶
John's use of hilasmos (G2434) operates in a different context from Paul's hilasterion. Where Paul surrounds hilasterion with wrath vocabulary, John surrounds hilasmos with purification and love vocabulary.
The immediate context of 1 John 2:2 is 1 John 1:5-2:1: "God is light" (1:5), "the blood of Jesus Christ his Son cleanseth (katharizo) us from all sin" (1:7), "faithful and just to forgive (aphiemi) us our sins, and to cleanse (katharizo) us from all unrighteousness" (1:9), "we have an advocate (parakletos) with the Father, Jesus Christ the righteous" (2:1). The hilasmos of 2:2 appears within a framework of light, cleansing, forgiveness, and advocacy — not wrath.
The LXX background of hilasmos confirms this expiation orientation. The canonical word study (G2434-hilasmos.md) shows that the LXX used hilasmos for kippur (H3725, the atonement institution), selichah (H5547, forgiveness), and chattaah (H2403, sin offering). hilasmos unifies cultic atonement, relational forgiveness, and sacrificial offering under one term.
1 John 4:10 is the most theologically significant hilasmos verse: "Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation (hilasmon) for our sins." God's love is the cause that produces the hilasmos. The tense contrast reinforces this: "we have loved" (egapekamen, perfect — our completed, ongoing love) versus "he loved" (egapesen, aorist — God's single decisive act). God does not begin to love because Christ propitiates; God sends Christ as hilasmos because God already loves.
This verse eliminates any reading of propitiation as a change in God's disposition. If propitiation meant "making an angry God favorable," then God would need to become favorable AFTER the propitiation. But 1 John 4:10 says God's love precedes and causes the propitiation. The hilasmos is an expression of divine love, not a condition for it. This does not eliminate the wrath dimension — rather, it reframes the relationship: God's love is the reason he provides the means to address his own just wrath. Love and wrath coexist; love provides the solution.
Hebrews 2:17: The Verb in Action¶
The verb form hilaskomai (G2433) appears in Heb 2:17 in a priestly context: Christ became like his brethren "that he might be a merciful and faithful high priest in things pertaining to God (ta pros ton theon), to make reconciliation (eis to hilaskesthai) for the sins (tas hamartias) of the people."
The grammatical construction is significant. hilaskesthai takes "the sins" (tas hamartias) as its direct object in the accusative case. In classical Greek propitiation, the deity is the object — one propitiates the god. Here, sins are the object — one propitiates/expiates the sins. This grammatical pattern fits expiation (acting on sins to remove them) more naturally than propitiation (acting on God to turn away wrath).
Yet the same verse identifies the priestly work as ta pros ton theon — "in things pertaining to God." The direction of the work is Godward. The priest represents the people before God, dealing with the sins that stand between them. The verb acts on the sins; the purpose is Godward. Both dimensions are present in a single sentence.
The LXX background of hilaskomai (canonical word study G2433-hilaskomai.md) bridges salach (H5545, "to forgive/pardon," PMI 15.77 — the highest correlation, and a verb used exclusively of God) and kaphar (H3722, "to atone/cover," PMI 10.41). The verb hilaskomai thus bridges the relational-forgiveness domain (salach) and the cultic-atonement domain (kaphar). In Luke 18:13, the publican's plea — hilastheti moi, "be propitiated/merciful to me" — reflects the salach domain: a prayer for divine forgiveness with no ritual or sacrifice involved. In Heb 2:17, the verb reflects the kaphar domain: priestly atonement for the people's sins.
The kapporeth Background: What It Requires¶
The kapporeth (H3727, canonical word study H3727-kapporeth.md) is central to the question because the LXX's consistent rendering of kapporeth as hilasterion (16 times, PMI 9.75) establishes the vocabulary bridge between the OT mercy seat and the NT propitiation language.
The kapporeth's theology is spatial. The law (the two tablets of testimony) sits inside the ark. The kapporeth (cover/atonement-place) sits above the law. On the Day of Atonement, blood is sprinkled on the kapporeth and before it (Lev 16:14-15). God's presence appears above the kapporeth between the cherubim (Exo 25:22; Lev 16:2). The spatial arrangement means that when God's presence encounters human sin (the broken law below), it encounters the blood-covered kapporeth in between.
What does this spatial theology encode? Two readings are possible, and both are supported by different aspects of the evidence:
The expiation reading: Blood on the kapporeth purifies the contaminated space. Israel's sins have defiled the sanctuary (Lev 16:16 — "because of the uncleanness of the children of Israel"). The blood cleanses that defilement so God can continue to dwell among his people. The kapporeth is a purification site.
The propitiation reading: Blood on the kapporeth shields the people from the lethal divine presence. "That he die not" (Lev 16:2, 13) — God's presence kills the unclean. The blood on the kapporeth stands between the holy God and the sinful people. The kapporeth is a shield or buffer.
The Hebrew evidence does not choose between these readings because the Hebrew concept does not make the distinction. Purification (removing defilement so God can dwell among his people without destroying them) and propitiation (shielding the people from the lethal divine presence) describe the same act from different angles. If the defilement is removed, the divine presence is no longer lethal. If the divine presence is no longer lethal, it is because the defilement has been removed. The two are not sequential; they are simultaneous and inseparable.
This is precisely what the kapporeth background requires: a refusal to separate what Hebrew thought unified. When Paul calls Christ the hilasterion (Rom 3:25), he invokes the entire kapporeth theology — the law, the cover, the blood, the divine presence — and applies it to Christ. Christ stands between God's justice and human sin. His blood addresses both the defilement (expiation) and the danger (propitiation) simultaneously.
Two LXX Translation Streams, One Hebrew Source¶
The previous study (atone-01) established that katharizo (G2511) in Heb 9:23 is the LXX rendering of taher (H2891), the DOA purification verb, with 61 co-occurrences (canonical word study TR-taher-katharizo.md). The present study adds the hilasterion-kapporeth bridge (16 co-occurrences, PMI 9.75, canonical word study TR-kapporeth-hilasterion.md). These are two distinct LXX translation streams entering the NT independently:
Stream 1 (purification): Hebrew taher → LXX katharizo → NT katharizo (Heb 9:23 — heavenly purification) Stream 2 (propitiation): Hebrew kapporeth (from kaphar) → LXX hilasterion → NT hilasterion (Rom 3:25 — propitiation)
Both streams trace back to the same OT institution (the DOA), the same OT verb (kaphar), and the same blood application (on the kapporeth/in the sanctuary). The two streams represent two Greek vocabulary choices for the same Hebrew reality. Paul uses the propitiation stream; the author of Hebrews uses both the propitiation stream (9:5, hilasterion as mercy seat) and the purification stream (9:23, katharizo for heavenly cleansing). John uses a related term from the propitiation family (hilasmos) but in a purification context (1 John 1:7-9).
The convergence of these two streams in the NT demonstrates that the biblical authors themselves do not treat propitiation and expiation as competing alternatives. They are two vocabulary families describing the same atoning reality, selected by each author based on the immediate rhetorical context. Paul, writing to address the wrath problem (Rom 1:18–3:20), uses propitiation vocabulary. The author of Hebrews, explaining the DOA typology, uses both. John, writing about walking in light and being cleansed from sin, uses the propitiation noun in a purification context.
The Blood as Both Purifier and Protector¶
Blood is the common instrument across all these texts, and it functions differently depending on context. In the DOA (Lev 16:14-15, 19), blood cleanses the sanctuary from defilement — it is a purifier. In the Passover (Exo 12:13, 23), blood shields from destructive judgment — it is a protector. In Rom 3:25, blood is the medium of the hilasterion. In Heb 9:14, blood purges the conscience. In 1 John 1:7, blood cleanses from sin. In Rom 5:9, blood saves from wrath.
Leviticus 17:11 provides the foundational principle: "it is the blood that maketh an atonement for the soul." Blood atones because it carries life — a life given in place of the sinner's life. God says "I have given it to you upon the altar" — the blood-atonement system is God's provision, not a human device to manipulate God. This parallels 1 John 4:10 where God sends the hilasmos, and Rom 3:25 where God sets forth the hilasterion. In every case, God is both the one whose justice requires satisfaction and the one who provides the satisfying means.
The dual function of blood (purifying and protecting) maps directly onto the dual function of atonement (expiation and propitiation). The blood cleanses the defiled (expiation) and shields from the judgment that defilement provokes (propitiation). These are not two separate blood ministries but two dimensions of one ministry. A disinfectant that removes a deadly pathogen both purifies the body (expiation) and protects from the disease the pathogen would cause (propitiation). The act is one; the description depends on which aspect you emphasize.
God as Both Offended Party and Remedy Provider¶
One of the most striking patterns across the evidence is that God consistently occupies both sides of the atoning transaction. God is the one whose holiness makes the problem (Lev 16:2 — "that he die not"), whose wrath punishes the problem (Num 16:46 — "wrath gone out from the LORD"), and whose justice demands resolution (Rom 3:26 — "that he might be just"). Yet God is also the one who provides the blood for atonement (Lev 17:11 — "I have given it"), who sets forth the hilasterion (Rom 3:25 — "whom God hath set forth"), who sends the hilasmos (1 John 4:10 — "he loved us, and sent his Son"), and whose love initiates the entire process (Rom 5:8 — "while we were yet sinners, Christ died for us").
This dual role rules out any crude propitiation model where the Son must placate an unwilling Father. God is not the reluctant recipient of propitiation — God is the active provider of it. At the same time, this dual role does not eliminate the reality of divine wrath. God's love does not cancel God's wrath; God's love provides the means to address it. The hilasterion/hilasmos is how the loving God resolves the problem that his own justice creates. Romans 3:26 captures this: the hilasterion exists "that he might be just, AND the justifier" — God maintains his justice while extending mercy, and the hilasterion is the instrument that makes both possible.
Word Studies¶
The canonical word studies reveal that the hilask- word family operates across two Louw-Nida domains: Domain 40 (Reconciliation, Forgiveness) and Domain 88.10 (Mercy, Merciless). This dual placement reflects the word family's inherent breadth — it is not purely cultic/sacrificial, nor purely relational/emotional. It bridges both.
hilasterion (G2435) has only two NT occurrences but carries enormous semantic weight because of its LXX background. The near-perfect correlation with kapporeth (PMI 9.75) means that any first-century Greek reader familiar with the LXX would hear "mercy seat" when encountering hilasterion. Paul's anarthrous usage in Rom 3:25 shifts from the specific object (the mercy seat) to the function (a propitiatory) — Christ is not the mercy seat but he fills the role that the mercy seat occupied.
hilasmos (G2434) appears only in 1 John (2:2; 4:10). Its LXX sources — kippur, selichah, chattaah — unify what Hebrew treated as three distinct concepts: the atonement institution, the forgiveness experience, and the sin offering. hilasmos in the NT absorbs all three. Christ is the atonement institution (he IS the hilasmos), the means of forgiveness (peri ton hamartion hemon, "for our sins"), and the offering (sent by God, 4:10).
hilaskomai (G2433) bridges salach (divine forgiveness, PMI 15.77) and kaphar (cultic atonement, PMI 10.41) in the LXX. This explains its dual character in the NT: the publican's plea in Luke 18:13 echoes the salach tradition (divine mercy), while the priestly action in Heb 2:17 echoes the kaphar tradition (ritual atonement). The verb takes sins as its direct object in Heb 2:17 but God as its implied addressee in Luke 18:13 — showing it can function in both directions.
The paresis/aphesis distinction in Rom 3:25 deserves special attention. paresis (G3929) is a hapax — it appears nowhere else in the NT. It means "passing over" or "letting go without penalty," distinct from aphesis (G859, "remission/forgiveness"). God had been exercising paresis toward sins committed before Christ — a temporary overlooking that did not fully resolve the sin problem. The hilasterion provides the ground that retroactively justifies this forbearance: God was not unjust in passing over those sins because the hilasterion was always the intended resolution.
Difficult Passages¶
1 John 4:10 — Love as the cause of propitiation¶
This verse creates the strongest tension for any pure propitiation model. If propitiation means "changing God's disposition from wrath to love," then God should become loving AFTER the propitiation. But 1 John 4:10 says God's love is the cause: "not that we loved God, but that he loved us, and sent his Son to be the propitiation." The resolution is that propitiation does not change God's character but addresses a real condition (sin, guilt, defilement) that God's justice requires to be addressed. God's love provides the means; God's justice defines the need. Both are true simultaneously. The propitiation does not make God love sinners — it allows the God who already loves sinners to justly forgive them.
Hebrews 2:17 — Sins as the direct object¶
The grammar of hilaskesthai tas hamartias ("to propitiate/expiate the sins") makes sins, not God, the object of the verb. In classical propitiation, the deity is the object. This grammatical shift pushes toward expiation (acting on sins to remove them) rather than propitiation (acting on God to turn away wrath). However, the phrase ta pros ton theon ("in things pertaining to God") in the same verse identifies the Godward direction. The best resolution: the priestly action acts ON sins FOR God — the direction is Godward (propitiation) but the mechanism operates through sin-removal (expiation). The priest does not change God's mind; the priest removes what offends God's holiness. Both dimensions remain.
The silence of Leviticus 16 on wrath¶
The DOA ritual — the very institution that defines the kapporeth and provides the type for hilasterion — contains no wrath vocabulary at all. If the kapporeth is the type behind Rom 3:25, and the kapporeth ritual is purely purification, then the typological background supports expiation, not propitiation. The propitiation dimension enters from outside the DOA: from Num 16:46-48 (wrath-aversion through incense), Num 25:11-13 (wrath-turning through zeal), Psa 78:38 (kaphar bridging forgiveness and anger-turning), and the Passover (blood averting destruction). Paul's contribution in Romans is to place the hilasterion into a wrath context that the DOA itself does not contain. The propitiation reading of hilasterion in Rom 3:25 comes from Paul's rhetorical context (three chapters of wrath discourse), not from the kapporeth typology itself.
Luke 18:13 — hilaskomai without ritual or sacrifice¶
The publican's prayer uses hilaskomai with no blood, no sacrifice, no ritual at all. This shows the word family can function as a simple plea for divine mercy. If hilaskomai can mean "show mercy" without any atoning content, this complicates the assumption that it always carries propitiation/expiation meaning. The LXX context explains this: hilaskomai renders salach (divine forgiveness) more often than kaphar (cultic atonement). The word family is broader than either propitiation or expiation — it includes the basic concept of divine mercy. Luke 18:13 reflects the mercy domain; Rom 3:25 and Heb 2:17 reflect the atonement domain.
The anarthrous hilasterion in Romans 3:25¶
Paul uses hilasterion without the article in Rom 3:25, while the author of Hebrews uses it with the article in 9:5. The anarthrous usage emphasizes quality or function rather than specific identification. Paul may not be saying "Christ IS the mercy seat" (one-to-one typological equation) but rather "Christ functions as a propitiatory" (functional analogy). If this is correct, then the DOA purification context of the physical kapporeth is less determinative for the meaning of hilasterion in Rom 3:25, and the immediate Pauline wrath context becomes more important. The anarthrous form allows Paul to invoke the mercy-seat concept while giving it new content shaped by his wrath discourse.
Conclusion¶
The biblical evidence requires a both/and answer. When Paul calls Christ the hilasterion (Rom 3:25) and John calls him the hilasmos (1 John 2:2; 4:10), they are describing both propitiation and expiation — not because they use the words imprecisely but because the Hebrew concept behind both Greek words (kaphar) inherently encompasses both functions.
The propitiation dimension is firmly established. Paul places the hilasterion after three chapters of wrath discourse (Rom 1:18; 2:5,8; 3:5) and explicitly connects blood to wrath-deliverance (Rom 5:9 — "justified by his blood, we shall be saved from wrath"). The OT provides clear precedents for kaphar as wrath-aversion (Num 16:46-48 — incense stopping the plague; Num 25:11-13 — zeal turning away anger; Psa 78:38 — kaphar bridging forgiveness and wrath-turning). The Passover blood (Exo 12:13) — the strongest typological basis for propitiation — functions as pure wrath-aversion, and Paul identifies Christ as "our passover" (1 Cor 5:7). Deliverance from divine wrath through Christ is attested across Paul (Rom 5:9; 1 Thess 1:10; 5:9) and cannot be reduced to metaphor.
The expiation dimension is equally firmly established. The Day of Atonement (Lev 16), which provides the kapporeth typology behind hilasterion, uses exclusively purification vocabulary with no wrath language at all. Hebrews 2:17 takes sins as the direct object of hilaskomai — the verb acts on sins, not on God. The LXX renders kaphar as katharizo (purification) 14 times (PMI 5.18), and Heb 9:23 uses katharizo for the heavenly counterpart of the DOA ritual. John's hilasmos appears in a context dominated by cleansing language (1 John 1:7 — blood cleanses; 1:9 — God cleanses from unrighteousness). The removal of sin's defilement is a central, inescapable dimension of what the hilask- words describe.
The Hebrew kapporeth background requires holding both together. The mercy seat is the place where God's presence meets sacrificial blood above the broken law. Removing the defilement is what makes the divine presence safe; making the divine presence safe is accomplished by removing the defilement. Propitiation and expiation are not competing explanations — they are two descriptions of the same act viewed from different angles. The biblical authors, writing in Greek, choose which vocabulary to emphasize based on their rhetorical context: Paul emphasizes propitiation when addressing the wrath problem (Romans); the author of Hebrews emphasizes purification when explaining the DOA typology; John embeds propitiation language within a purification framework.
The most important theological finding is that God himself initiates and provides the propitiation/expiation. God "set forth" the hilasterion (Rom 3:25). God "sent his Son to be the hilasmos" (1 John 4:10). God "gave" the blood for atonement (Lev 17:11). God's love is the cause of the hilasmos, not its result (1 John 4:10). This means the atonement is not a human or even a merely Christward act designed to change God's mind. It is God's own provision for a problem that God's own holiness and justice create. God is, as Rom 3:26 puts it, "just, AND the justifier" — maintaining justice and extending mercy through the same act, the hilasterion through faith in Christ's blood.
Study completed: 2026-05-03 Files: 01-topics.md, 02-verses.md, 03-analysis.md, 04-word-studies.md