The interpretation timeline
Isaiah 58:9 Douay-Rheims

Then shalt thou call, and the Lord shall hear: thou shalt cry, and he shall say, Here I am. If thou wilt take away the chain out of the midst of thee, and cease to stretch out the finger, and to speak that which profiteth not.

A.D. 373 – 1871 7 witnesses

Patristic

before A.D. 750
373
A.D.
c. A.D. 296–373
“God is always one and the same; but people have come to be afterwards through the Word, when the Father himself willed it; and God is invisible and inaccessible to originated things, especially to people on earth. When then people in infirmity invoke him, when in persecution they ask help, when they pray as they endure injuries, then the Invisible, being a lover of people, shines forth on them with his beneficence, which he exercises through and in his proper Word. And forthwith the divine manifestation is made to every one according to his need, and is made to the sick, and to the persecuted a "refuge" and "house of defense."”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Were he distant from us in place, you might well doubt, but if [God] is present everywhere, to him that strives and is in earnest he is near.… What father would ever be thus obedient to his offspring? What mother is there, so ready and continually standing, in case her children call her? There is not one, no father, no mother, but God stands continually waiting … and never, when we have called as we ought, has he refused to hear.”
Source

Scholastic

c. 1100 – 1500
1167
A.D.
Ibn Ezra Jewish
1089–1167
“From thy midst. From thy heart, or from the midst of Israel. מוטה Yoke. Slavery. שׁלַח The putting forth. It is a verbal noun similar in form to the infinitive שְׁכַב to lie (1 Kgs. 1:21). The putting forth of thy finger, that is, the stretching out of the hand to smite the neighbour or to take away his property. ודבר And to speak. דבר is a verbal noun.”
Source
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Cry out, do not cease. Here he excludes the useless remedy by which they wished to prepare themselves for salvation. And first he enjoins the office of denunciation, setting down the manner of denouncing: that it be loud, without a fear that weighs down: cry out. Above, 40: lift up your voice with strength, you who bring good tidings to Zion. That it be continuous: do not cease. Below, 62: upon your walls, Jerusalem, I have appointed watchmen; all day and all night they shall not be silent. That it be clear and open, as a trumpet. Hosea 8: let there be a trumpet in your throat. And the word of denunciation: declare crimes — as to the greater ones; sins — as to the common ones. Above, 16: to those who rejoice over the walls of baked brick, speak of their wounds. Secondly the prophet excludes, in the person of the Lord, the useless remedy: for indeed me. And concerning this he does two things. First he excludes the remedy in which they trusted; secondly he exhorts to those things in which they were lacking: is not this. Concerning the first, two things. First he shows the presumption of their confidence as to three things in which they trusted: namely, in the inquiry of sacred knowledge: for indeed they seek me — in the Scriptures — my ways, my precepts and my wills, as a nation, that is, as if they were prepared to do them. Ezekiel 33: they say, one to another. Again in prayer: they ask of me judgments, that is, that I should judge for them against their adversaries, to draw near, with the mouth. Above, 29: this people draws near with its mouth. Again they trusted in the observance of fasts: why have we fasted, and you have not regarded it, as if it were pleasing; we have humbled ourselves — as to the circumstance surrounding the fast, in exterior humiliation — you have not known, with the knowledge of approval. Malachi 3: vain is he who serves God: and what profit is it, that we have kept his precepts? Secondly he shows the reprobation of the goods just mentioned. And first the cause of the reprobation, which is the fault of pleasure: behold, in the day — the will, in those things which please the flesh. Ecclesiasticus 18: go not after your lusts. Likewise the fault of cruelty: and all debtors — literally, so that they might persist for a long time in pursuing lawsuits, or with reference to what follows from it. James 4: you quarrel and you fight. Likewise the fault of vanity: do not fast that you may be heard — for the sake of human praise. Matthew 6: but when you pray, enter into your chamber, and having shut the door, pray to your Father. Or, that it may be heard; that is, if you wish that your prayer be heard by God. Psalm 101: Lord, hear my prayer, and let my cry come to you. Secondly he shows the insufficiency of the goods: is such — because God does not choose your punishment for its own sake, nor for the affliction of the flesh, which he touches in what he says: through the day, the whole day, to afflict. Nor as to the abjection of exterior humility, which he touches in what he says, as a circle; that is, bowing the head to the feet, or turning it about, as monks do, not insofar as it is ordered to the virtue of the mind. Matthew 6: when you fast, do not become sad like the hypocrites. Joel 2: rend your hearts, and not your garments. Is not this. Here he applies useful counsel: and first as to the zeal of piety toward one's neighbor; secondly as to the worship of religion toward God, if you turn away. Concerning the first he does two things. First he sets down the counsel of piety, that they should give up calumny: bonds — false causes, by which they cunningly bound the poor as usurers do; bundles — the same, weighing down, as to the penalties to which they bound them. Who are broken — by long servitude; burden — of servitude. Matthew 23: they bind heavy and unbearable burdens; but with their own finger they are unwilling to move them. And that they may attend to mercy, exhorting to mercy: as to the hungry, break — that is, even if you have but little; as to the wandering, and the needy; as to the naked, when you see. Job 31: if I have denied what they wished. And he sets down the cause of the exhortation: and the flesh — because, namely, it is of the same species as you. Job 5: visiting your species. Secondly he shows the fruit of the counsel: and it shall break forth. And first as to the efficacy of merits. Then as to the works of virtue: as the morning, your light; that is, your merits shall clearly appear in their rewards, which now you complain are not regarded by the Lord. It shall gather — from captivity, or in the protection of mercy. Psalm 36: he will bring forth your justice as the light. Then as to the support of prayer: then you shall call upon. Above, 30: at the voice of your cry, as soon as he hears it, he will answer you. Secondly as to the attainment of goods. And first he resumes the merit: if you take away the chain — with which you oppress the poor; to stretch out the finger — by detracting and threatening; when you shall have poured out — through compassion; you shall have filled — through the supplying of necessities. Secondly he promises the reward: it shall rise. And first as to the multiplication of goods, setting down deliverance from evils: it shall rise in the darkness — adversity shall be changed into the light of prosperity, ignorance into the light of knowledge, or sin into the light of knowledge, as to spiritual things. And rest — as to temporal evils. 2 Corinthians 4: God, who said, out of darkness. The multiplication of interior spiritual goods: he will fill with splendors — namely, with virtues or consolations; and your bones — as to bodily things. Ecclesiasticus 30: a splendid and good heart. And of exterior goods: and you shall be as a garden — on account of prosperity, or the unfailingness of all goods. Numbers 24: how beautiful are your tabernacles, Jacob. Secondly as to the rebuilding of the homeland: and there shall be built, after the return from captivity, of the ages — that is, the cities deserted in former ages — you shall raise up, by building upon the ancient foundations. Above, 44: who say to Jerusalem, you shall be inhabited; and to the cities of Judah, you shall be built. Thirdly as to the restoration of reputation: and you shall be called the builder of hedges, that is, of the obstacles of sin; of iniquities; or into rest — namely, converting the paths of sin into rest. Hosea 2: I will hedge up your ways with thorns. If you turn away. Here he sets down counsel as to the worship of religion in the observance of the sabbath. And first he sets down the counsel: the foot — lest you do forbidden works. You shall be called the sabbath, that is, one celebrating this sabbath, as to the exercise of good works. Exodus 20: remember to keep holy the sabbath day. Another text has: you shall have called; and the sense is the same. Secondly he sets down the fruit: then you shall delight — as to spiritual goods; I will lift you up — by bringing you back into your land, which is mountainous; I will feed you — as to the enjoyment of the goods of the land. Job 22: then you shall abound with delights over the Almighty. Note, on that word, lift up like a trumpet, that preaching is a trumpet. First, because it rouses to the state of life. 1 Corinthians 15: for the trumpet shall sound, and the dead shall rise incorrupt. Secondly, because it exhorts to battle. 1 Corinthians 14: if the trumpet gives an uncertain sound, who will prepare himself for battle? Thirdly, because it announces the approach of a man. Above, 27: it shall be sounded with trumpets. Fourthly, because it calls to counsel. Hosea 8: let there be a trumpet in your throat. Fifthly, because it invites to a feast. Psalm 80: blow the trumpet at the new moon. Likewise note, on that passage, if you take away from your midst the chain, what a chain is. First, of piety. Ephesians, last chapter: for which I perform an embassy in this chain. Secondly, of iniquity. Wisdom 17: for they were all bound together by one chain of darkness. Thirdly, of poverty. Job 36: if they shall have been bound. Fourthly, of servitude. Jeremiah 28: wooden chains. Fifthly, of prison. Ecclesiastes 4: for out of prison and chains one sometimes comes forth to a kingdom.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Then shall thou call, and the Lord shall answer,.... A spirit of grace and supplication will be poured out upon the people of God; they will then pray without a form, and call upon the Lord in sincerity and truth, with faith and fervency; and the Lord will hear and answer them, and plentifully bestow his favours on them, so that they will have no reason to complain, as in Isa 58:3, thou shalt cry, and he shall say, here I am; he will immediately appear to the help and relief of his people; they shall have his presence with them, to comfort and refresh them, to support and supply them, to protect and defend them: if thou take away from the midst of thee the yoke; of human inventions, doctrines, rites and ceremonies, as in Isa 58:6, "the putting forth of the finger"; pointing at those that could not comply with them, by way of scorn and derision, as puritans, schismatics, &c. and persecuting them for it; and so is the same with smiting with the fist of wickedness, Isa 58:4; when this deriding and persecuting spirit is done away, then, and not till then, will the prayers of a people be heard, though under a profession of religion, and under the Protestant name: and speaking vanity; which also must be taken away, or desisted from; even speaking false doctrines, as the Syriac version; or which profits not, as the Vulgate Latin version; profane and vain babblings, Ti2 2:14, and threatening words, to such who will not receive them.”
Source
1849
A.D.
1774–1849
“Finger, contemptuously, or threatening. (St. Jerome) — Some explain it of the ordaining sacred ministers, or taking another’s property.”
1871
A.D.
1871
“Then . . . call . . . answer--when sin is renounced (Isa 65:24). When the Lord's call is not hearkened to, He will not hear our "call" (Psa 66:18; Pro 1:24, Pro 1:28; Pro 15:29; Pro 28:9). putting forth of . . . finger--the finger of scorn pointed at simple-minded godly men. The middle finger was so used by the Romans. speaking vanity--every injurious speech [LOWTH].”
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.