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Quick answer: The Greek word most closely tied to atonement is ἱλαστήριον (hilasterion), pronounced hil-as-TAY-ree-on, Strong’s G2435. It is a noun meaning the place or means of atonement, and it appears only twice in the New Testament: as “propitiation” in Romans 3:25 and as “mercyseat” in Hebrews 9:5. Neither verse says “atonement.” The only time the King James New Testament uses that English word is Romans 5:11, and the Greek there is a different word entirely, katallage (G2643), which means reconciliation. Greek divides what English packs into one word: hilasterion names where sin is dealt with, and katallage names what happens between two estranged parties once it has been.
Word Study: Where “Hilasterion” Comes From
Hilasterion is built on the verb hilaskomai (G2433), and behind that sits a small adjective, hileos (G2436), meaning gracious or favorable. So the family begins with a disposition: someone being well-disposed toward you.
The teaching is in the ending. The Greek suffix -terion regularly turns an action into the place where that action happens, and you can watch it work across the New Testament:
- desmoterion (G1201), from the word for a bond: the place of bonds, a prison. “Now when John had heard in the prison the works of Christ” (Matthew 11:2).
- thysiasterion (G2379), from the word for a sacrifice: the place of sacrifice, an altar.
- akroaterion (G201), from the verb to listen. The King James translators simply spelled this one out: Agrippa and Bernice “entered into the place of hearing” (Acts 25:23).
Put that ending on the atonement verb and you get a word whose natural sense is the place of atoning, or the thing where atoning gets done. That is worth stopping on. In English, atonement sounds like a feeling or a concept. The Greek word has an address.
The address came from the translators of the Septuagint, the Greek version of the Hebrew Scriptures. They faced the Hebrew kapporet, the gold lid of the ark, whose name means something like “the covering” (the story of that word is in our study of the Hebrew word for atonement). Greek had a perfectly ordinary word for a lid, epithema, and at Exodus 25:17 the translators used both: hilasterion epithema, an atoning lid. Then, in the verses that follow, they dropped the word for “lid” and kept only hilasterion. The Hebrew name describes what the object does to what lies beneath it. The Greek name leaves the carpentry behind and says what the object is for.
It was not reserved for the ark, either. In the Greek of Ezekiel 43:14, 17 and 20, hilasterion names the ledge of the great altar, the place where blood is applied. And outside the Bible, writers used the word for things people set up to get right with a higher power: Josephus for a monument built to propitiate God, and the orator Dio Chrysostom for something far more famous. In his contrarian retelling of the Trojan War (Discourse 11), the Greeks leave an offering inscribed “A Propitiation from the Achaeans to Athena of Ilium,” and the offering is the Trojan Horse. A Jewish martyr text, 4 Maccabees 17:22, even speaks of a hilasterion death, a death that atones.
That background makes Paul’s sentence sharper. In those examples, people set up the hilasterion. In Romans 3:25, God is the one who sets it up.
The place of atoning turned out to be a person. If you want to know Jesus, not only the word, the free sample of 30 Days Walking with Jesus brings His words, actions and love to life through easy-to-read devotionals, built for anyone just starting out or wanting to rekindle the connection. Start below:
Where “Hilasterion” Appears in the Bible
The New Testament uses this noun only twice, so the first two rows are the complete list. The other three are from the Old Testament, where the English says “mercy seat” and the Greek translation says hilasterion.
| Reference | Text (KJV) | What the word is doing |
|---|---|---|
| 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;” | Paul applies the word to Jesus |
| Hebrews 9:5 | “And over it the cherubims of glory shadowing the mercyseat; of which we cannot now speak particularly.” | The literal object in the tabernacle |
| Exodus 25:17 | “And thou shalt make a mercy seat of pure gold: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof.” | First appearance, in the Greek paired with the word for “lid” |
| Exodus 25:22 | “And there I will meet with thee, and I will commune with thee from above the mercy seat, from between the two cherubims which are upon the ark of the testimony…” | What the object was for: meeting |
| Leviticus 16:14 | “And he shall take of the blood of the bullock, and sprinkle it with his finger upon the mercy seat eastward; and before the mercy seat shall he sprinkle of the blood with his finger seven times.” | The Day of Atonement, where the blood went |
Why does one Greek word come out as two English ones? Part of the answer is Latin. Jerome’s Vulgate kept a place-word, propitiatorium, for the object in Exodus and Hebrews, but wrote propitiationem in Romans 3:25, and English has inherited that same split. The result is that an English reader can go a lifetime without knowing that Romans 3:25 and Hebrews 9:5 share a word.
Verse Deep Dive: Romans 3:25-26, the Question Behind the Word
“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; To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.” (Romans 3:25-26, KJV)
We have already written about what “set forth” means for the hidden mercy seat, so read this time for a different thing: the reason Paul gives. Most of us assume the verse exists to answer “How does God stop being angry with me?” Paul says, twice, that it exists to answer a different question.
1. “Remission” here is not the usual word. The ordinary New Testament word for forgiveness is aphesis (G859), which we traced in the Greek word for forgiveness. Paul does not use it here. He writes paresis (G3929), a word found nowhere else in the New Testament, which carries the sense of passing over or letting go by. That is why many modern translations say God “passed over” former sins. The King James “remission” smooths out something rough.
2. That creates a problem, and it is God’s problem. “Sins that are past” means all those centuries before Jesus. David’s sin. Israel’s sin. A long record of people being spared. Psalm after psalm thanks God for it. But Paul looks at that record and sees what a good courtroom would see: a judge who keeps letting the guilty go home. “The forbearance of God” is lovely until you ask what it says about justice. A judge who overlooks wrongdoing is not merciful; that judge is corrupt. So the question sitting underneath Romans 3:25 is not “Is God angry?” It is “Is God actually just?”
3. “To declare” is a word about proof. The Greek is endeixis (G1732), a showing, a demonstration, and Paul uses it in both verses. The hilasterion is the evidence. Whatever else happened at the cross, Paul’s first claim here is that God’s righteousness was being put on the record, after a long stretch in which it could have looked doubtful.
4. The sentence refuses to pick a side. “That he might be just, and the justifier.” In Greek those are one word family, dikaios and dikaioo, standing almost side by side. Paul will not let mercy win by beating justice, or justice win by beating mercy. Atonement is how God stays just while declaring the guilty right.
That is what the word adds. Mercy could always be announced. The hilasterion shows why it was never a cover-up.
Not All “Atonement” Is the Same
The New Testament’s atonement vocabulary is really two families. The first is very small: each of the first four words below appears only twice.
| Word | Meaning | Where you meet it (KJV) |
|---|---|---|
| hilasterion (ἱλαστήριον, G2435) | The place or means of atonement | “propitiation” (Romans 3:25), “mercyseat” (Hebrews 9:5) |
| hilasmos (ἱλασμός, G2434) | Atonement as the act or the thing itself | “he is the propitiation for our sins” (1 John 2:2; also 4:10) |
| hilaskomai (ἱλάσκομαι, G2433) | To atone for, or to be gracious | “to make reconciliation for the sins of the people” (Hebrews 2:17); “God be merciful to me a sinner” (Luke 18:13) |
| hileos (ἵλεως, G2436) | Gracious, favorable | “I will be merciful to their unrighteousness” (Hebrews 8:12); “Be it far from thee” (Matthew 16:22) |
| katallage (καταλλαγή, G2643) | Exchange, then reconciliation | “we have now received the atonement” (Romans 5:11) |
Look at the hileos row, because it holds a small shock. When Jesus first tells the disciples that he must go to Jerusalem and be killed, Peter takes him aside: “Be it far from thee, Lord: this shall not be unto thee” (Matthew 16:22). The Greek behind “be it far from thee” is hileos soi, an idiom along the lines of “God be gracious to you,” meaning “God forbid.” No one in the scene would have been thinking about vocabulary, and it would be too much to build a doctrine on an idiom. But it is striking all the same: the word family of atonement is on Peter’s lips at the very moment he tries to talk Jesus out of the cross.
Then there is katallage, the word the King James actually renders “atonement.” Its first home was the money-changer’s table, where it meant an exchange. In the New Testament it describes former enemies brought back together: “when we were enemies, we were reconciled to God by the death of his Son” (Romans 5:10). Notice who needs reconciling. Scripture speaks of us being reconciled to God, and of God “reconciling the world unto himself” (2 Corinthians 5:19). It never turns the sentence around to say God had to be reconciled to us. Hebrews 2:17 runs the same way: the thing acted on is “the sins of the people.”
If you want to see the verb hilaskomai prayed by someone with nothing to offer, that story is in does God hear my prayers when I sin.
Why the Original Word Changes the Meaning
English gives us one word, “atonement,” built from “at one.” It tells you how the story ends. It does not tell you how the story gets there. The Greek words change the reading in three ways.
Atonement has an address. The -terion ending means the first question is not “How sorry am I?” or “How do I feel?” It is “Where?” In the tabernacle the answer was a gold lid behind a curtain. In Romans 3:25 the answer is Jesus. A person who wonders whether their guilt has been dealt with is sent to look somewhere outside themselves.
There are two steps, not one. English lets hilasterion and katallage blur together, but they do different work. One deals with the sin. The other deals with the relationship. Paul keeps the order: Romans 3 comes before Romans 5. People who have heard that they are forgiven can still live like estranged relatives, keeping polite distance from God. The word Paul uses for what they have “received” in Romans 5:11 is a word for enemies coming home.
Your peace does not rest on God overlooking things. This may be the most practical change of all. If mercy means God looks the other way, you can never quite relax, because the thing is still sitting there unanswered. Romans 3:25-26 says it was answered, publicly, in a way that keeps God just. The forgiveness you are leaning on is not a loophole.
Living It Out
Most of us carry something we privately file under “got away with it.” Nothing ever came of it, nobody found out, and life went on. It does not feel forgiven. It feels unattended, like a bill that never arrived.
That is exactly the category Paul has in mind with paresis: sins let go by. So try this once this week. Write that one thing down in a single plain sentence. Under it, write out Romans 3:26: “that he might be just, and the justifier.” Then read the two together and notice that the thing you thought had been skipped has been addressed.
Then take the second step, the katallage one. Paul says God “hath given to us the ministry of reconciliation” (2 Corinthians 5:18). Pick one relationship where you have settled for polite distance, and make one small move toward it: a message, a call, an apology you have been postponing.
Journal Prompts
- Hilasterion ends in a place-marker: the word answers “where?” When guilt shows up, where do you actually go first: your own feelings, your own effort, or somewhere else? What would it look like to go to the place Romans 3:25 names?
- Paul uses paresis, sins passed over, for what happened before the cross. Is there something in your past you have filed as overlooked instead of dealt with? Write about the difference between those two, and which one you have been living in.
- Peter said hileos soi, “God forbid,” to the very thing that would save him. Where have you been trying to talk God out of a path that does not look like what you expected?
Prayer
Lord, I have treated some of my failures as things you never noticed, and others as things I must keep paying for. Neither is true. Thank you that the hilasterion was not something I built or brought. You set it forth yourself, in Jesus, so that your mercy would never have to hide from your justice. Here is the thing I filed away as overlooked. I bring it to the place you provided. And where I have accepted your pardon but kept my distance, bring me all the way home. In Jesus’ name, Amen.
Share This
If this study helped you, here are two posts you can copy and share:
- The Greek word for atonement, hilasterion, ends the same way as the words for “prison” and “altar.” It is a place-word. Atonement is not first a feeling. It has an address, and Romans 3:25 names it. [Post URL]
- Romans 3:25 does not start with “Is God angry?” It starts with “Is God just?” For centuries sins had been passed over, and the cross is where Paul says God’s justice went on the record. Mercy was never a cover-up. [Post URL]
FAQ
What is the Greek word for atonement?
The word most closely tied to atonement is hilasterion (ἱλαστήριον, Strong’s G2435), meaning the place or means of atonement, along with its relatives hilasmos (G2434) and hilaskomai (G2433). The single place the KJV New Testament prints the English word “atonement,” Romans 5:11, uses a different Greek word, katallage (G2643), which means reconciliation.
Does hilasterion mean “mercy seat” or “sacrifice” in Romans 3:25?
Scholars are divided, and both readings have real support. For “mercy seat”: the Greek Old Testament uses the word that way repeatedly, and Hebrews 9:5 uses it that way too. For “atoning sacrifice”: Romans 3:25 has no definite article, unlike Hebrews 9:5, and 4 Maccabees 17:22 applies the word to a death. Either way, Paul’s point stands: God provides it, and it involves “his blood.”
What is the difference between hilasterion and hilasmos?
Both come from the same family and both are translated “propitiation” in the KJV, but they are different words. Hilasterion (Romans 3:25) has a place-ending and points to where or by what atonement happens. Hilasmos (1 John 2:2 and 4:10) names atonement itself. John says Jesus is the hilasmos, the atonement; Paul says God set Jesus forth as the hilasterion.
Why does Romans 3:25 say “remission” if the Greek means “passing over”?
The Greek paresis (G3929) appears only here in the New Testament. It can mean passing over or letting go by, and some ancient usage leans toward release from a penalty, so the KJV’s “remission” is not baseless. But it is a different word from the usual aphesis (G859), and many modern translations render it “passed over” because the point of the verse is that earlier sins had not yet been answered.
Where to Start
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