What is the difference between sin, transgression, and iniquity?

Question 6004.

Sin, transgression and iniquity appear together so often in Scripture that many readers assume they are interchangeable, but each word carries its own weight, and together they diagnose us more thoroughly than any one of them alone. When David poured out Psalm 51 after his fall with Bathsheba, he reached for all three: “blot out my transgressions. Wash me thoroughly from my iniquity, and cleanse me from my sin!” (Psalm 51:1-2). That is not padding; it is precision. Let me show you what each term contributes.

Sin: Missing the Mark

The foundational word is sin itself. The Hebrew chata and the Greek hamartia both picture an arrow falling short of its target. Judges 20:16 uses the same root of the seven hundred left-handed slingers who could sling a stone at a hair “and not miss.” Sin is failure against a standard: “all have sinned and fall short of the glory of God” (Romans 3:23). The standard is not respectability but the glory and character of God Himself, which is why nobody clears the bar. I have set out the full definition in What is sin?.

Notice that missing the mark includes both our worst moments and our best. Even our righteous deeds fall short of the pure love of God and neighbour that the law requires. Sin, in this first sense, covers the shortfall of the whole life, not only its scandals.

Transgression: Crossing the Line

The second word sharpens the charge. The Hebrew pesha, usually rendered transgression, means revolt or rebellion, the deliberate crossing of a known boundary. Nations transgress treaties; subjects transgress against kings. Where sin can picture weakness, transgression pictures defiance: I knew the line was there, and I stepped over it. Paul uses the parallel Greek idea when he says “sin is not counted where there is no law, yet death reigned… even over those whose sinning was not like the transgression of Adam” (Romans 5:13-14). Adam had an explicit command and broke it; that is transgression in its purest form.

This distinction matters for honest self-examination. Some of my failures take me by surprise; others I walked into with my eyes open, past the warnings of Scripture, conscience, and the Spirit. Transgression and iniquity are both darker than mere shortfall, and Scripture refuses to let me file my deliberate rebellions under honest mistakes. Yet here is the grace: “Blessed is the one whose transgression is forgiven” (Psalm 32:1), and the suffering Servant was “pierced for our transgressions” (Isaiah 53:5). The wilful crossings, not only the accidental wanderings, were laid on Him.

Iniquity: The Inner Crookedness

The third word goes deepest. The Hebrew avon, iniquity, comes from a root meaning to bend or twist. Sin describes the act, transgression the attitude, and iniquity the condition: the warp in the timber, the crookedness in the nature that makes straight living impossible. David traces his adultery not just to a bad decision but to a bent stock: “Behold, I was brought forth in iniquity, and in sin did my mother conceive me” (Psalm 51:5). Iniquity also carries the idea of accumulated guilt that must be borne: the scapegoat “shall bear all their iniquities” (Leviticus 16:22), and of the Servant we read, “the LORD has laid on him the iniquity of us all” (Isaiah 53:6).

If sin says I missed, and transgression says I rebelled, iniquity says I am twisted, and the twist is heavier than the acts it produces. This is why behaviour management never cures the human condition, and why the gospel must go deeper than turning over new leaves. The crooked heart needs to be made new, which is precisely what God promises: a new heart and a new spirit (Ezekiel 36:26). The inherited bent I describe here is closely related to the sin nature.

Three Words, One Confession

Put the three together and you see why David needed every one of them. His sin missed the mark of God’s glory; his transgression defied a known commandment, “You shall not commit adultery”; his iniquity welled up from a nature bent since conception. Full confession names all three dimensions. Shallow confession says, mistakes were made. Biblical confession says: I have fallen short, I have rebelled, and the trouble goes all the way down. And full pardon answers all three: Psalm 32:5 gathers them into one verse, “I acknowledged my sin to you… I will confess my transgressions to the LORD, and you forgave the iniquity of my sin.”

The Old Testament’s richest self-revelation of God uses the same triad from the other side. The LORD passed before Moses proclaiming Himself “forgiving iniquity and transgression and sin” (Exodus 34:7). Whatever vocabulary your guilt speaks, His mercy speaks it fluently. There is no category of wrongdoing outside the reach of His forgiveness.

Why the Distinctions Matter Today

Am I splitting hairs? I do not think so, for two reasons. First, precision honours Scripture. The Spirit chose these words, and flattening them loses what He inscribed; the difference between transgression and iniquity is the difference between what I did and what I am, and both need the cross. Second, precision helps the struggling believer. If you only ever confess acts, you will be bewildered by the persistence of the appetite behind them; naming the iniquity teaches you to seek not just pardon but transformation. Equally, if you only ever lament your fallen condition, naming particular sins and transgressions keeps repentance concrete rather than vague.

And precision magnifies grace. When Peter tells us that Christ “himself bore our sins in his body on the tree” (1 Peter 2:24), and Isaiah that He was pierced for our transgressions and crushed for our iniquities, the Spirit is declaring that every layer of our ruin was answered at Calvary: the shortfall, the rebellion, and the twistedness, all carried, all atoned, all forgiven in Him.

Transgression and Iniquity Through the Whole Bible

Once you have the three words, you begin to see how deliberately Scripture deploys them. The prophets reach for transgression and iniquity when they want to name both the rebellion and the rot beneath it. Isaiah opens his book with sons who have rebelled and “a people laden with iniquity” (Isaiah 1:2-4), defiance on the surface and a crushing accumulated weight underneath. Micah closes his prophecy marvelling at a God “pardoning iniquity and passing over transgression” (Micah 7:18), and adds the most vivid image of forgiveness in the Old Testament: “you will cast all our sins into the depths of the sea.” Daniel’s great prayer of confession heaps the vocabulary together, “we have sinned and done wrong and acted wickedly and rebelled” (Daniel 9:5), because national repentance, like personal repentance, needed every word. When the fifty-third chapter of Isaiah gathers the Servant’s work, it distributes our ruin across the full vocabulary: transgressions, iniquities, and in verse 12 he “bore the sin of many, and makes intercession for the transgressors.”

The distinction between transgression and iniquity also illuminates how Scripture speaks about guilt before God accumulating and being borne. Iniquity, avon, is the word most often used with the verb to bear: the goat bears iniquity, the priest bears iniquity, the Servant bears iniquity. Sin is committed; transgression is chosen; iniquity is carried, by the sinner or by a substitute. That grammar is the grammar of the gospel. Either I carry my own twisted record into judgment, or Another carries it for me. When Peter writes that Christ “himself bore our sins in his body on the tree” (1 Peter 2:24), he is using the ancient language of the sin-bearing sacrifice and declaring the account settled.

Is there a danger of over-reading the distinctions? A fair warning: the terms overlap in many passages, Hebrew parallelism often pairs them as near-synonyms, and we should not build separate theologies on every occurrence. The value of distinguishing sin, transgression and iniquity is devotional precision rather than rigid systematics: the words give confession its full range, from the shortfall I did not intend, through the line I crossed knowingly, to the crookedness I cannot straighten. Used that way, the vocabulary does what God’s word always does: it tells the truth about us more thoroughly than we would tell it about ourselves, and then it tells the better truth about grace.

Here is a practical exercise that has served me well. Take Psalm 51 this week and pray it slowly, pausing at each of David’s three words, sin, transgression and iniquity, asking the Spirit to show you your own instances of each. You will find the exercise humbling; you will also find it strangely freeing, because sin, transgression and iniquity named honestly are sin, transgression and iniquity forgiven fully. The believer who learns this vocabulary does not become morbid; he becomes precise, and precision in confession produces peace in conscience, “the peace of God, which surpasses all understanding” (Philippians 4:7). Vague guilt lingers for years; named guilt can be cleansed in an evening.

So, now what?

Next time you pray a prayer of confession, borrow David’s vocabulary rather than the culture’s. Tell God where you missed the mark, where you crossed lines you knew were there, and how deep the crookedness runs, and then thank Him that Exodus 34:7 is still His name: forgiving iniquity and transgression and sin. Honest words open the way for a thorough cleansing. When did your confession last use all three?

“The LORD passed before him and proclaimed, The LORD, the LORD, a God merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness, keeping steadfast love for thousands, forgiving iniquity and transgression and sin.” (Exodus 34:6-7, ESV)