The interpretation timeline
Isaiah 41:14 Douay-Rheims

Fear not, thou worm of Jacob, you that are dead of Israel: I have helped thee, saith the Lord: and thy Redeemer the Holy One of Israel.

1105 – 1875 7 witnesses

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“O worm of Jacob Heb. תּוֹלַעַת. The family of Jacob, which is weak like a worm, which has no strength except in its mouth. תּוֹלַעַת is vermener in O.F., [vermisseau in Modern French, a worm]. the number of Israel Heb. מְתֵי יִשְׂרָאֵל, the number of Israel.”
1167
A.D.
Ibn Ezra Jewish
1089–1167
“Thou worm Jacob, Israel had been considered by the Babylonians as worms. Fear not, that you will be killed together with the Babylonians. עזרתיך I will help thee. The future is here expressed by the past (עזרתיך), because all the divine decrees concerning the future, are considered as sure as if they were already fulfilled; besides the difference between past and future exists only with regard to created beings.”
Source
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“"Let them be silent before me," etc. Here he begins to strengthen them toward a firm expectation, from the love of the God who promises. And it is divided into three parts. In the first he shows divine love from the benefits which he showed to the fathers; in the second, from the son whom he promised them, chapter 42: "Behold my servant," etc.; in the third, through the consolations which he foretells amid various distresses, chapter 43: "And now thus says the Lord," etc. Now by the benefits previously bestowed he intends the strengthening of the Jews and the refutation of the idols, which did not show such things to their worshippers; and therefore the first part is divided into two. In the first he disputes against the worshippers of idols; in the second against the idols themselves, at "Come near," etc.; the first into two: for first, by the benefits bestowed on the Jews, he convicts the adversaries; second, by the same he strengthens the Jews, "And you, Israel, my servant," etc. Concerning the first, three things. First he summons the nations to judgment, pursuing the order of judgment, that being silent they may hear, and thus respond. "Let them renew their strength," that is, let them strengthen themselves as if renewed in strength to dispute with me. Micah 6: "Let the mountains hear the judgment," etc. Second he recounts the benefit that was shown, "who called," where he recounts the multitude of benefits: as to the divine election, "from the east," namely Chaldea; "the just one," Abraham. Genesis 12, Job 23: "he has followed his steps," etc., Jeremiah 13: "as a girdle cleaves," etc., Hosea 9: "like the first fruits of the fig tree," etc.; as to the power granted, "he will give in his sight," namely when he freed Lot, fighting against four kings: Genesis 14. Psalm 1: "not so the wicked, not so," etc.; as to the ease of carrying it out, "he will pass in peace," that is, without labor; "the path," etc., as one who walks lightly, as it were leaving no trace of the way; or because the labor is in the feet, no sign of the way is left behind. Above, 40: "they shall run, and not labor," etc.; he seeks the author: "who has wrought this," and "who," calling, by eternal foreknowledge, below, 49: "the Lord from the womb," etc.; and he gives the response: "I the Lord," etc., Apocalypse 1: "I am Alpha," etc. Otherwise, according to the letter, it is expounded of Cyrus; mystically, of Christ. Third, he sets forth, as it were, the response of the Gentiles, in which they believed they could defend themselves by means of idols. And first he touches on their astonishment at the things alleged or the wonders seen, "the islands saw," etc., Psalm 76: "the waters saw you, O God," etc.; "they drew near," to resist. Second, he sets forth their mutual encouragement, "each one," etc., Job 40: "one shall cleave to another," etc. Third, he sets forth the fabrication of idols: "the one striking will strengthen," the iron with the hammer, he was forging, he was shaping the figure of the idol; saying of the glue, "it is good," for consolidating the idol: Wisdom 13: "setting it on the wall," etc. "And you, Israel," etc. In this part he strengthens the Jews from these same benefits: and first there is set forth the repetition of the past benefit in the election of the fathers Jacob and Abraham, by which they were universally distinguished from others: "Jacob whom," etc., Psalm 104: "the seed of Abraham his servant," etc., Romans 11: "but according to the election," etc. Second, there is set forth the promise of future things: and first as to immunity from evils, excluding fear: both on account of God's presence, "do not fear, because," etc., Jeremiah 1: "do not fear before the face," etc.; and on account of the justice of the fathers, "he has taken you up," as the promised seed, "of my just one," Abraham. Or "he has taken up," to defend, "the just one," Cyrus. Psalm 90: "in their hands they shall bear," etc.; setting forth also the removal of enemies as to their confusion, "behold they shall be confounded." Jeremiah 17: "let them be confounded who persecute me," etc.; as to destruction, "they shall be as if they were not." Above, 30: "to bring the nations to nothing," etc.; and the impossibility of restoration, "you shall seek them," etc., Psalm 36: "I saw the wicked, above," etc.; showing also the reason for the destruction, "because I the Lord," etc., Psalm 143: "send forth your hand," etc. Second, as to the abundance of goods: and first against servitude, setting forth the very yoke of servitude: "fear not, worm"; as one who is held vile and trodden upon like a worm, and reckoned as dead. Psalm 21: "I am a worm," etc.; setting forth also the divine help. Below, 41: "I have helped," etc.; setting forth also the benefit of exaltation, as to the subjugation of enemies, "I have set you," etc., above, 25: "and Moab shall be threshed," etc., which perhaps refers to the time of the Maccabees. And as to their exultation, "and you shall exult," etc., Canticle 1: "we shall rejoice and exult," etc. Second, against poverty, setting forth first the hardship of poverty, "the needy and the poor," etc., above, 5: "her nobles have perished," etc.; second, the divine purpose: "I the Lord," etc., Psalm: "he shall call upon me and I," etc.; third, he sets forth the benefit as to the abundance of waters in mountainous places: "I will open on the heights," etc., above, 30: "there shall be upon the mountain," etc.; and in desert places, "I will make a desert," that is, your land, previously deserted. Psalm 106: "he has turned the desert into pools," etc.; and as to the beauty of the trees, "I will give in the wilderness," etc., Ezekiel 30: "the plantations have multiplied," etc.; fourth, he sets forth the fruit of the benefit, "that they may see," etc., Ecclesiasticus 36: "let them know that there is no God," etc. "Come near," etc. Here he sets forth the dispute against the idols themselves: and first he sets forth the dispute; second, the determination of the sentence, "and I saw, and there was not," etc. Concerning the first, two things. First he disputes against the idols with universal arguments; second, by an argument taken from a certain particular deed, "I have raised up," etc. Concerning the first, three things. First he summons them to judgment: "come near," that is, draw near to me, that we may be judged together — you idols, or idolaters; "bring forth," that is, allege, if you have anything, that you may prove yourselves gods; "if you have something to say," etc., Psalm 81: "God has stood in the assembly," etc. Second, he proposes a twofold argument. One taken from divine knowledge, which fully knows all things, past and future, which the idols do not have: "the former things, what they were," etc. Ecclesiasticus 23: "to the Lord God before they were created," etc.; the other is taken from divine power, which can punish and do good: "also do good," etc., Baruch, last chapter: "nor if they suffer any evil," etc. Third, he concludes their defect: as to the material cause, "behold you," idols, are from nothing, from created matter; as to the formal cause, "a work," that is, an artificial form, which fashions in you a divinity that is not; and as to the efficient cause, "an abomination," that is, abominable — or: "you," the craftsmen; "your work," namely the idols; "who chose," the worshippers. 1 Corinthians 8: "we know that an idol," etc., Jeremiah 10: "every craftsman is confounded," etc. "I have raised up." Here he takes up a certain special deed to argue against the idols, and first he foretells a certain future thing: "from the north," the Chaldean; "from the east," the Persian, who subjugated to themselves various lands and princes. "Plastes," that is, the potter; "plasma," the thing formed. Mystically: by him who is from the north, the Gentile; by him who is from the east, Christ. Psalm 17: "as the mire of the streets," etc. Second, from this, under a question, he proposes the argument: that he who can foretell this is justly to be called God; and he who cannot, is not. "Who has announced it?" Below, 48: "assemble yourselves and hear," etc. Third, he excludes from the idols any indication of divinity: "there is none announcing," any among you gods; nor, any of the worshippers, "hearing," etc., Psalm 113: "they have eyes, and shall not see," etc. Fourth, he shows in the true God the sign of divinity. "The first," that is, our singular God. "Behold I am present," in help, the Evangelists, announcing future things. Daniel 2: "truly your God is God," etc.; or "the first," the prophet of the Lord, in the person of God; or "the first": the firstborn Son of God. Ephesians 4: "and he gave some indeed," etc. "And I saw." Here, from the dispute set forth above, he concludes the determination of the sentence: and it is evident of itself. Jeremiah 10 and 11: "they are vain, and a work worthy of laughter," etc. (Collationes, chapter 41.) Christ passed over in the peace of flesh to spirit, which he had — Job 5: "you shall know that it has peace," etc.; of man to neighbor, which he taught — below, 52: "how beautiful upon the mountains," etc.; of the world to God, which he made — Ephesians 2: "he made peace," etc. There moves one to preach: the instinct of faith — Psalm: "I believed, therefore," etc., 2 Corinthians 4, Apocalypse, last chapter; the goad of zeal — Jeremiah 20: "and it became in my heart," etc.; the greatness of the reward — Matthew 5: "whoever shall do and teach," etc. Christ took us up as a victor a captive, to set free — Genesis, last chapter: "to the prey, my son," etc.; Psalm: "lead out of custody"; as a physician the sick, to heal — Psalm: "who is merciful to all," etc.; as an advocate the accused, to excuse — 1 John 1: "we have an advocate," etc.; as the strong the weak, to defend — below, 63: "I who speak justice," etc., Exodus: "the Lord will fight," etc.; as a bridegroom the bride, to rejoice together — Hosea 2: "I will espouse you to me," etc. Water: tears poured out — Jeremiah 9: "who will give to my head," etc.; the cleanness of baptism — John 3: "unless one be born again," etc.; spiritual grace — John 7: "he who believes in me, rivers," etc.; divine wisdom — Ecclesiasticus 24: "I, wisdom, have poured forth," etc.; inner joy — Proverbs 5: "drink water," etc.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Fear not, thou worm Jacob,.... Being like a worm, exposed to danger, and liable to be trampled upon and crushed, mean and despicable in their own eyes, and in the esteem of others; and it may be Jacob, or the true Israelites, are so called, because of their impurity in themselves, of which they are sensible; and chiefly because of their weakness and impotence to defend themselves, and resist their enemies. It is an observation of Jarchi, Kimchi, and Ben Melech, that the strength of a worm lies in its mouth, which, though tender, can strike the strongest cedar, and penetrate into it; and the latter observes, that the strength of Israel lies in their prayers, as Jacob's did, when, wrestling with the angel, and making supplication, he had power with God, and prevailed. Now, though the saints are such poor, weak, and contemptible things, yet the Lord bids them not fear any of their enemies, he would take their part, and protect them: and ye men of Israel; the Vulgate Latin version renders it, "ye dead men of Israel" (s); such as were accounted as dead men, and had no more respect shown them than the dead, that are remembered no more; or were exposed to death daily, for the sake of Christ and his Gospel; or that reckoned themselves dead to sin, and did die daily to it, and lived unto righteousness: or, "ye few men of Israel", as others (t) render it; Christ's flock is a little flock, his church is a little city, and few men in it, in comparison of the men of the world: I will help thee, saith, the Lord, and thy Redeemer, the Holy One of Israel; which is repeated for the confirmation of it, and is the more strongly assured by these characters of a Redeemer of his people out of the hands of all their enemies, and the holy and just God, and sanctifier of them, which he here takes to himself, and makes himself known by. (s) "mortales Israeliae", Castalio. (t) , Sept. "viri pauci Israel", Munster, Montanus; "Israel, qui pauco es numero", Tigurine version.”
Source
1849
A.D.
1774–1849
“Dead. Though you were in the grave, I could protect you. Captivity is often represented under this idea. (Calmet) — You who are despised, fear not, since Christ will protect and reward you. (Worthington)”
1871
A.D.
1871
“worm--in a state of contempt and affliction, whom all loathe and tread on, the very expression which Messiah, on the cross, applies to Himself (Psa 22:6), so completely are the Lord and His people identified and assimilated. God's people are as 'worms' in humble thoughts of themselves, and in their enemies' haughty thoughts of them; worms, but not vipers, or of the serpent's seed." [HENRY]. men--The parallelism requires the word "men" here to have associated with it the idea of fewness or feebleness. LOWTH translates, "Ye mortals of Israel." The Septuagint, "altogether diminutive." MAURER supports English Version, which the Hebrew text best accord with. the Lord--in general. and thy redeemer--in particular; a still stronger reason why He should "help" them.”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“The consolatory words, "Fear not," are now repeated, for the purpose of once more adding the promise that Israel will not succumb to its foes, but will acquire power over its enemies. "Fear not, thou worm Jacob, and handful Israel: I will help thee, saith Jehovah; and thy Redeemer is the Holy One of Israel. Behold, I have made thee a threshing roller, a sharp new one, with double edges: thou wilt thresh mountains, and pound them; and hills thou wilt make like chaff. Thou wilt winnow them, and wind carries them away, and tempest scatters them: and thou wilt rejoice in Jehovah, and glory in the Holy One of Israel." Israel, which is now helplessly oppressed, is called "worm of Jacob" (gen. appos.) in compassion, i.e., Jacob that is like a worm, probably with some allusion to Psa 22:7; for the image of the Messiah enriches itself in these discourses, inasmuch as Israel itself is looked upon in a Messianic light, so that the second David does not stand by the side of Israel, but appears as Israel's heart, or true and inmost essence. The people are then addressed as the "people of Israel," with some allusion to the phrase מספּר מתי (i.e., few men, easily numbered) in Gen 34:30; Deu 4:27 (lxx ὀλιγοστὸσ ̓Ισραήλ; Luther, Ir armer hauffe Israel, ye poor crowd of Israel). They no longer formed the compact mass of a nation; the band of the commonwealth was broken: they were melted down into a few individuals, scattered about hither and thither. But it would not continue so. "I help thee" (perfect of certainty) is Jehovah's solemn declaration; and the Redeemer (redemtor, Lev 25:48-49) of His now enslaved people is the Holy One of Israel, with His love, which perpetually triumphs over wrath. Not only will He set it free, but He will also endow it with might over its oppressors; samtı̄kh is a perfect of assurance (Ges. 126, 4); mōrag (roller) signifies a threshing-sledge (Arab. naureg, nōreg), which has here the term חרוּץ (Isa 28:27) as a secondary name along with חדשׁ, and is described as furnished on the under part of the two arms of the sledge not only with sharp knives, but with two-edged knives (פּיפיּות a reduplication, like מאסּאה in Isa 27:8, whereas מימי is a double plural). Just like such a threshing machine would Israel thresh and grind to powder from that time forth both mountains and hills. This is evidently a figurative expression for proud and mighty foes, just as wind and tempest denote the irresistible force of Jehovah's aid. The might of the enemy would be broken down to the very last remnant, whereas Israel would be able to rejoice and glory in its God.”
Source
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.