The interpretation timeline
Isaiah 50:9 Douay-Rheims

Behold the Lord God is my helper: who is he that shall condemn me? Lo, they shall all be destroyed as a garment, the moth shall eat them up.

A.D. 215 – 1871 6 witnesses

Patristic

before A.D. 750
215
A.D.
c. A.D. 150–215
“There is a person who runs down birth, describing it as subject to decay and death, who forces things and suggests that the Savior was speaking about having children in saying that we should not store treasure on earth, where it grows rusty and moth-eaten. And [this person] is not ashamed to set alongside these the prophet's words: "You shall all grow old like clothes, and the moth will feed on you." We do not contradict Scripture. Our bodies are subject to decay and are naturally unstable. Perhaps he might be prophesying decay to his audience because they were sinners. The Savior was not speaking about having children. He was encouraging sharing of resources in those who wanted only to amass vast amounts of wealth rather than offer help to those in need.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“a moth Heb. עָשׁ, the worm of the clothing.”
1167
A.D.
Ibn Ezra Jewish
1089–1167
“Behold the Lord, etc. Since God assists me, who will condemn me ? And all those that condemn me by their words, they will wax old as a garment. יבלו They shall wax old. They shall perish.”
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Thus says the Lord: Who is this, etc. Here he begins to remove the impediments to liberation: and first he removes the impediments; second he applies remedies, chapter 53: Who has believed the report, etc. Concerning the first he removes three impediments. First, the lack of divine benefits; second, the rejection of persons, chapter 51: Hear me, you who follow, etc.; third, the poverty of things, chapter 52: Arise, arise, etc. Concerning the first, three things. First he excludes the impediment; second he sets himself forth as an example: The Lord has given me, etc.; third he concludes with wholesome counsel: Who among you that fears, etc. Concerning the first, two things. First he excludes the lack of divine benefits on the part of the divine will, second on the part of the divine power: Is it shortened, etc. Concerning the first, three things. First he excludes a defect of the divine will, as though God of himself did not wish to do good, excluding a twofold manner of alienation: namely, the manner of putting away a wife, which was by a bill of divorce, as is said in Deuteronomy 24, which indeed was permitted to them on account of the hardness of their heart, Matthew 19: Who is this, etc. But against this, Jeremiah 3: because she had committed adultery, etc. And it must be said that the Lord, as far as is in himself, did not repudiate them; but they, through their own sins, forsook God. He also excludes the manner of alienating a possession: Or who is the creditor, etc., as if to say: you who are my inheritance. Above, 19: I should have sold to him, not having anything else to pay — whence it is clear that, since I have not alienated you from my lordship, I am prepared to do good as far as it is in me. Second, he shows the sin of the human will: For behold, in iniquities — Romans 7: For I am a carnal man, sold under sin. Third, he sets forth an argument: because I came, through inspiration; I called, through the prophets. Proverbs 1: I called, and you refused. Is it shortened? Here he excludes the defect on the part of the divine power, excluding first a defect of power: shortened, as though I could not even subject those far off to myself; small, against powers. Below, 59: Behold, the hand of the Lord is not shortened. Second, he sets forth a sign of the divine power: Behold. First in the waters: in rebuke, that is, at command, I will do it, if I will, just as I did at the going out of Israel from Egypt, Exodus 14; I will make rivers, as the Arnon, Numbers 21, and the Jordan, Joshua 4; they will rot, as in Exodus 7, when the waters were turned into blood. Psalm 105: He rebuked the Red Sea, and it was dried up. Second, he shows signs of his power in the heavens: I will clothe the heavens — the airy ones — with darkness, as in Egypt, Exodus 10. Psalm 146: Who covers the heaven with clouds. The Lord has given. Here he sets himself forth as an example: and first as to the grace of the benefit received; then as to eloquence — a learned tongue, to sustain, with encouragements: Job 4: they strengthened the wavering; then also as to wisdom — he raises up, to attend, in the morning, from the beginning of my preaching, or from the beginning of my age. Or because at that time he was accustomed to pray, Psalm 62: In the mornings I will meditate on you. He has opened, for understanding, Psalm 84: I will hear what the Lord God speaks in me. Matthew 23: One is your master, Christ. Second, he sets himself forth as an example as to obedience, setting forth perfect obedience: But I do not contradict — rather I receive, and I accept his inspiration; I did not go backward, from a good purpose. Above, 45: Woe to him who contradicts his maker. He also sets forth the constancy of obeying, because he did not give up obedience for any danger: I have given my body; that is, I exposed myself to suffer such things. Or perhaps he suffered these things literally; but it was fully fulfilled in Christ, Matthew 26 and 27. Jeremiah 12: I have given my beloved soul into the hands of enemies. Third, he sets himself forth as an example as to the confidence which he had in God, first setting forth a ready defense: The Lord God is a helper — Jeremiah 20: The Lord is with me like a strong warrior. Second, the security of that confidence: and he set me, that I might not be moved by fear or shame. Ezekiel 3: I have made you like adamant and flint. Third, he assigns the reason for the security from the power of the one helping: Near is he who justifies, namely, God. Who will contradict? By words. Let us stand together. Job 17: Set me, Lord, next to you, and let anyone's hand fight against me. Adversary — by deeds. Let him condemn — by false judgments. Romans 8: God who justifies, who is it that condemns? Again, from the weakness of the one attacking: Behold, all of them like a garment — by old age, in which there is a natural defect; the moth, in which there is violence. Job 13: who am to be consumed like rottenness, and like a garment that is eaten by a moth. As if he were to say: from all these things, just as I, after having received benefits, obey God and trust in him, so also you. Who among you? Here he concludes, from his own example, a wholesome counsel: and first he sets forth the counsel; second he sets forth the contempt of the counsel: Behold, all of you. Now he gives counsel that they should trust in God: whence he does three things. First he requires the fitness of those who trust, which is from fear and obedience — servant, of Isaiah, or of whatever other. Psalm 24: Who is the man who fears the Lord? Second he shows the necessity of confidence: who has walked in darkness — of error, or of adversity. John 11: He who walks in the night stumbles. Third he sets forth the counsel itself: let him hope in the name; above, 10: the remnant of Israel, etc. Behold, all. Here he sets forth the contempt of the counsel, setting forth three things. First the fault: kindling — by your sins — a fire, meriting it for yourselves; girded — as though bound in your sins, or made ready for sin. Above, 1: your strength shall be as the ash of tow. Second he sets forth the punishment: walk — as if he were to say, receive the punishment. Psalm 9: The sinner is caught in the labors of his own hands. Third he sets forth the power of the one punishing: from the hand, namely, of the power of God. You shall sleep — the sleep of death. Note, on that word, you are sold in iniquities, that man sells many things for sin. First, the virtue of the soul: Lamentations 1: They gave up all their precious things for a vile price. Second, the heavenly inheritance: 3 Kings 21: The Lord be merciful to me, that I should not sell the inheritance of my fathers. Third, the liberty of the soul: Ecclesiasticus 10: Nothing is more wicked than to love money. Fourth, the honor of divine love: Hosea 3: the Lord loves. Also, on that word, But I do not contradict, note that men contradict God: first, the unfaithful contradict the divine truth. Ecclesiasticus 4: Do not contradict the word of truth. Second, the impatient contradict the divine correction. Job 9: who contradicts him? etc. Third, the impenitent contradict the divine goodness. Above, 41: and they shall be as if they were not. Fourth, the disobedient contradict the divine authority. Hosea 4: your people. Also, on that word, you shall sleep in sorrows, that sinners grieve in death. First, on account of the loss of bodily things: Job 27: When the rich man shall sleep, he shall carry nothing with him. Second, on account of the contradiction of conscience: Wisdom 5: doing penance, and groaning for anguish of spirit. Third, on account of despair of future glory: Lamentations, last chapter: The crown has fallen from our head. Woe to us, for we have sinned. Fourth, on account of fear of punishment: Psalm 47: There sorrows as of a woman in labor, etc.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Behold, the Lord God will help me,.... This is repeated from Isa 50:7; see Gill on Isa 50:7; to show the certainty of it, the strength of his faith in it, and to discourage his enemies: who is he that shall condemn me? make me out a wicked person (c), prove me guilty, and pass sentence upon me, when thus acquitted and justified by the Lord God? The Apostle Paul seems to have some reference to this passage in Rom 8:33, lo, they all shall waste old as doth a garment; his enemies, those that accused him, the Scribes, Pharisees, and chief priests; and those that condemned him, the Jewish sanhedrim, and the Roman governor: the moth shall eat them up; they shall be like a worn out or motheaten garment, that can never be used more. The phrases denote how secret, insensible, and irrecoverable, their ruin should be, both in their civil and church state, all being abolished and done away. (c) "quis ipse impium faciet me", Pagninus, Montanus; "impium vel praevaricatorem et iniquum faciet me", Vatablus.”
Source
1871
A.D.
1871
“(Compare "deal," or "proper," Isa 52:13, Margin; Isa 53:10; Psa 118:6; Jer 23:5). as a garment-- (Isa 51:6, Isa 51:8; Psa 102:26). A leading constituent of wealth in the East is change of raiment, which is always liable to the inroads of the moth; hence the frequency of the image in Scripture.”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.