Isaiah 51:8 · Bible study
Isaiah 51:8 Commentary: Moth, Worm, and God's Eternal Righteousness
Hebrew · 9 what the commentators say
Meaning in one sentence
Isaiah 51:8 contrasts the destruction of oppressors (eaten by moth and worm) with the permanence of God's righteousness and salvation for His people.
Research Summary
- Meaning: Human oppressors are as fragile as a moth-eaten garment, while God's righteousness and salvation are eternal.
- Key words: Moth ('ash, H6211) and worm (sas, H5580) signify weak agents of destruction; righteousness (tsedaqah, H6666) implies God's covenant deliverance; forever (olam) and generations (dor) stress unending duration.
- Main debate: Whether “them” refers to the revilings (the reproaches themselves) or to the people who revile. Either way, the object is destroyed by insignificant means.
- Theological theme: Theodicy and assurance: God's justice will vindicate His people, and His salvation is more permanent than creation itself.
- Best use: Comfort for believers facing persecution, ridicule, or the apparent power of evil; a reminder that God's ultimate victory is certain.
Translation Comparison
BSB Berean Standard Bible 2020
For the moth will devour them like a garment, and the worm will eat them like wool. But My righteousness will last forever, My salvation through all generations.”
WEB World English Bible 2000
For the moth will eat them up like a garment, and the worm will eat them like wool; but my righteousness will be forever, and my salvation to all generations.”
KJV King James Version 1769
For the moth shall eat them up like a garment, and the worm shall eat them like wool: but my righteousness shall be for ever, and my salvation from generation to generation.
ASV American Standard Version 1901
For the moth shall eat them up like a garment, and the worm shall eat them like wool; but my righteousness shall be for ever, and my salvation unto all generations.
YLT Young's Literal Translation 1898
For as a garment eat them doth a moth, And as wool eat them doth a worm, And My righteousness is to the age, And My salvation to all generations.
Darby Darby Bible 1890
For the moth shall eat them up like a garment, and the worm shall eat them like wool; but my righteousness shall be for ever, and my salvation from generation to generation.
Douay-Rheims Douay-Rheims Bible 1899
For the worm shall eat them up as a garment: and the moth shall consume them as wool: but my salvation shall be for ever, and my justice from generation to generation.
Translations in other languages (10 available)
Porque como á vestidura los comerá polilla, como á lana los comerá gusano; mas mi justicia permanecerá perpetuamente, y mi salud por siglos de siglos.
Porque a traça os roerá como um vestido; e o verme os comerá com a lã; mas minha justiça durará para sempre, e minha salvação geração após gerações.
Car la teigne les dévorera comme un vêtement,
Denn die Motten werden sie fressen wie ein Kleid, und Würmer werden sie fressen wie wollenes Tuch; aber meine Gerechtigkeit bleibt ewiglich und mein Heil für und für.
Want de mot zal ze opeten als een kleed, en het schietwormpje zal ze opeten als wol; maar Mijn gerechtigheid zal in eeuwigheid zijn, en Mijn heil van geslacht tot geslachten.
Poiché la tignola li divorerà come un vestito, e la tarma li roderà come la lana; ma la mia giustizia rimarrà in eterno, e la mia salvezza, per ogni età.
Albowiem ich mól jako szatę pożre, a robak ich jako wełnę pogryzie; ale sprawiedliwość moja na wieki będzie, a zbawienie moje od narodu do narodu.
Ибо, как одежду, съест их моль и, как волну, съест их червь; а правда Моя пребудет вовек, и спасение Мое - в роды родов.
因為 蛀蟲 必咬他們，好像咬衣服；蟲子 必咬他們，如同咬羊絨。惟有我的公義 永遠 長存，我的救恩 直到萬 代。
For like a coat they will be food for the insect, the worm will make a meal of them like wool: but my righteousness will be for ever, and my salvation to all generations.
Verse in Context
Original Language (Biblical Hebrew)
Old Testament · Biblical Hebrew · Isaiah 51:8
Source: STEPBible TAGNT/TEHB (CC-BY 4.0). Click or tap a morphology code to see the full parsing.
Scholars' Consensus
Commentators across traditions see in this verse a clear contrast between the fate of human opposition and the enduring nature of God's salvation. Barnes notes that the moth and worm represent the weak and contemptible means by which God destroys the enemies of His people. As a garment is slowly but surely eaten, so the power of the oppressor is secretly consumed. Jamieson-Fausset-Brown agrees: they are destroyed by “as insignificant instrumentality as the moth that eats a garment.” Gill adds that this describes God's judgments, which are secret, gradual, sure and complete. Yet the weight of the verse falls on the second half. Matthew Henry captures the comfort: God's own righteousness and salvation are “for ever” and “from generation to generation.” This echoes verse 6, where heaven and earth themselves wear out, but God's salvation stands. The believers who fear human reproach (v.7) are told that their oppressors are as fragile as moth-eaten wool, while the covenant faithfulness of God never fades.
How settled is the interpretation?
Interpretive difficulty: Low
What is clear: God's righteousness and salvation are eternal and will prevail over all human opposition.
What Scholars Agree and Debate
| Topic | Agreed | Debated |
|---|---|---|
| Antecedent of 'them' | Both refer to something that opposes God's people. | Some commentators (e.g., Gill) suggest it may refer to the reproaches themselves; others (Barnes, Jamieson-Fausset-Brown) take it as the people who reproach. |
| Nature of the moth and worm | They represent insignificant agents of destruction. | Some see them as literal insects by which God judges; others as a metaphor for any weak means of judgment (e.g., disease, internal decay). The exact identity (moth vs. worm) may merge. |
| Duration of God's righteousness | It is eternal and certain. | Christians differ on whether this refers primarily to a future eschatological salvation or to a present deliverance from exile, though both are often affirmed. |
Historical & Cultural Context
This verse sits within a larger unit (Isaiah 51:1-16) addressed to the faithful remnant in exile. The Cambridge Bible notes that these are “words of cheer to the faithful but timid hearts” who struggle to trust the promise of deliverance. The people are in Babylon, surrounded by the power of a great empire. They face the reproach and insults of their captors (v.7). The prophet calls them to lift their eyes beyond the immediate scene.
The imagery of moth and worm would have been vivid to an ancient audience. Garments were a sign of wealth and security; a moth-eaten cloak meant ruin. The Hebrew word for moth, 'ash (H6211), and the word for clothes-moth, sas (H5580), appear together to emphasize total consumption. Wool especially was vulnerable to pests (Wesley notes woollen garments are “sooner corrupted”). The point is not merely that the oppressors will die, but that their demise will come through means as trivial as an insect. Barnes cites a historical incident from Niebuhr about the Guinea-worm, showing how a tiny creature could bring down the mightiest.
The contrast is not just between strong and weak, but between temporary and eternal. The phrase tsedaqah (righteousness) here carries the nuance of deliverance and covenant faithfulness. In v.5, God's righteousness is “near” and His salvation has “gone out”, it is already in motion. The exiles are to see that the empire that holds them is like a rotting garment, but the God who made covenant with Abraham (v.2) is everlasting. The repetition of “forever” (le'olam) and “to all generations” (ledor dorim) roots this promise in the unchanging character of God.
Textual Notes
The supplied sources note no significant textual variants for Isaiah 51:8. The verse is stable across the Hebrew manuscripts and ancient versions.
Reception History
From the early church onward, this verse has been a source of comfort for those facing persecution. The image of the moth eating the garment was applied to the temporary power of the Roman Empire and later to oppressive regimes. In the Reformation era, it was cited to encourage believers facing hostility. The promise that God's salvation endures “to all generations” has been sung in hymns of refuge and included in liturgy for times of national distress. It continues to anchor the hope of Christians who feel outnumbered but trust in the enduring reign of God.
Preaching This Verse
Three-point outline
- The Insignificance of Human Power. The moth and worm devour the garment. Human opposition, no matter how great, is subject to decay. God can use the smallest means to bring down the proud.
- The Certainty of God's Righteousness. God's righteousness is not temporary. It stands forever. This righteousness includes His saving action on behalf of His people.
- The Call to Fear Not. Because human threats are fleeting and God's salvation is eternal, the faithful are urged not to fear reproach (v.7). The contrast removes the sting of persecution.
Five-point outline
- Context: The Fear of Reproach. The verse follows a command to not fear the reproach of men (v.7). The moth/worm imagery addresses the root of that fear.
- The Means of Destruction. The moth and worm represent agents that are small and slow, yet effective. God's judgment on oppressors is certain even when unseen.
- The Certainty of Decay. Just as a garment wears out, so does the influence of the wicked. Nothing human lasts.
- The Permanence of God's Salvation. “My righteousness” and “my salvation” are qualities of God that do not fade. They have a future for all generations.
- The Result: Enduring Hope. Believers are anchored in something more durable than any earthly power. This hope carries them through suffering.
Illustration hooks
- Finding a moth hole in your favourite sweater. Even the most carefully preserved garment can be ruined by something barely visible. Human power is like that: fragile despite appearances.
- Time-lapse footage of a fruit decaying. The process is slow but unstoppable. The power of oppressive regimes eventually rots from within.
- The contrast between a building made of bricks and one of straw. The oppressor's kingdom is straw; God's salvation is stone.
Questions your congregation is asking
- “Why does God seem to allow the proud and wicked to flourish for so long?”
- “How can I hold onto hope when I am mocked for my faith?”
- “What does it mean that God's righteousness 'will be forever', is that a promise for my life now or only in the future?”
Leading a Discussion
This verse is a promise to those who feel the sting of rejection. The people of God in Isaiah's time were surrounded by a culture that mocked their trust in God. The prophet uses the image of a moth eating a garment to show how temporary and weak the power of the oppressor really is. And then he sets that against the unshakeable reality of God's salvation. As you read and discuss, consider how this applies to the pressures you face in your own life.
Discussion questions
- Read verses 7-8 aloud. What specific fear is the prophet addressing?
- Why do you think the prophet uses moths and worms to describe the fate of the enemies? What do these images communicate about their power?
- The verse says “my righteousness will be forever.” In the context of Isaiah, what does “righteousness” mean? Is it moral perfection, or deliverance, or both?
- How does the temporary nature of human opposition affect the way we handle criticism or persecution?
- Verse 6 says the heavens will vanish like smoke and the earth will wear out. How does the cosmic scale of that statement make the promise of v.8 even more powerful?
- What does it mean for you personally that God's salvation is “to all generations”? How does that shape your hope for your children or your church?
- Think of a situation where you feel afraid of what others think. How might the moth-and-garment image help you re-frame that fear?
Word Study
The key original-language words in this verse. Select any word for its full lexicon entry — meaning, every occurrence in Scripture, and related words.
Cross-References
Source: Treasury of Scripture Knowledge (TSK, public domain)
| Job 4:19 | How much more those who dwell in houses of clay, whose foundation is in the dust, who are crushed before the moth! |
| Job 13:28 | though I am decaying like a rotten thing, like a garment that is moth-eaten. |
| Isaiah 45:17 | Israel will be saved by Yahweh with an everlasting salvation. You will not be disappointed nor confounded to ages everlasting. |
| Isaiah 46:13 | I bring my righteousness near. It is not far off, and my salvation will not wait. I will grant salvation to Zion, my glory to Israel. |
| Isaiah 50:9 | Behold, the Lord Yahweh will help me! Who is he who will condemn me? Behold, they will all grow old like a garment. The moths will eat them up. |
| Isaiah 51:6 | Lift up your eyes to the heavens, and look at the earth beneath; for the heavens will vanish away like smoke, and the earth will wear out like a garment. Its inhabitants will die in the same way, but my salvation will be forever, and my righteousness will not be abolished. |
| Isaiah 66:24 | “They will go out, and look at the dead bodies of the men who have transgressed against me; for their worm will not die, nor will their fire be quenched, and they will be loathsome to all mankind.” |
| Hosea 5:12 | Therefore I am to Ephraim like a moth, and to the house of Judah like rottenness. |
Interlinear and lexical data from STEPBible (CC BY 4.0). Cross-reference data from OpenBible.info (CC BY 4.0). Commentaries are public domain.
For personal reflection
Read the devotional page — prayer, application, and "for families"
What the Commentators Say
7 public-domain commentaries, condensed into plain language.
Barnes' Notes on the Bible Protestant 1832
Barnes emphasises the striking contrast between human pride and utter frailty: even the moth, one of the smallest and most despised insects, can consume those who set themselves against God. He reinforces this by noting that a tiny worm can bring death, showing how the powerless creature becomes an instrument of divine judgment.
Geneva Bible Notes Reformed 1599
The Geneva Note stresses the stark contrast between human things and God's work. Garments and wool, no matter how fine, are eventually devoured by moths and worms. But God's righteousness and salvation are completely different: they last forever, passed down through every generation.
Gill's Exposition of the Bible Baptist 1748
Gill compares the slow, secret, but certain ruin of a moth-eaten garment to God’s judgment on His enemies. The contrast is deliberate: while the wicked are consumed completely, God’s righteousness and salvation endure forever, securing believers against every accusation.
Jamieson-Fausset-Brown Commentary Protestant 1871
JFB clarifies that the moth does not literally consume people. The metaphor stresses how God can destroy the proud through the most insignificant agents, just as a small moth ruins a garment, showing how easily human power can be brought down.
Keil & Delitzsch OT Commentary Protestant 1876
Keil-Delitzsch identifies the "servant of Jehovah" in this passage as the faithful kernel within Israel, the true people who have God's law in their hearts. This inner church, not the nation as a whole, is told not to fear human threats, because their persecutors will decay like a moth-eaten garment while God's righteousness stands forever.
Matthew Henry's Commentary Reformed/Presbyterian 1710
Henry draws the line sharply: God's comfort in these verses belongs only to those who have His law written in their hearts, not merely in their hands or heads. The permanence of God's righteousness stands in deliberate contrast to everything else — heaven, earth, and human enemies all pass away like a garment eaten by moths.
Wesley's Explanatory Notes Methodist/Wesleyan 1754
Wesley observes that the image of wool refers to a material moths ruin more quickly than linen. He highlights wool's greater vulnerability to corruption, making it a fitting symbol for something that is soon spoiled or passes away.