The interpretation timeline
Isaiah 56:8 Douay-Rheims

The Lord God, who gathereth the scattered of Israel, saith: I will still gather unto him his congregation.

1105 – 1875 6 witnesses

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“I will yet gather of the heathens ([Mss. and K’li Paz:] of the nations) who will convert and join them. (together with his gathered ones In addition to the gathered ones of Israel.)”
1167
A.D.
Ibn Ezra Jewish
1089–1167
“The outcasts of Israel, that came from Babylon, Elam, and Assyria. Beside those that are gathered unto him, that is, besides the proselytes. The meaning of the whole phrase is, Yet will I gather others to him, besides those that have already joined Israel. The suffix in לנקבציו, that are gathered unto him, refers to Israel.”
Source
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Thus says the Lord. Here, after he had promised liberation from evils, he begins to promise salvation in the conferring of goods. And it is divided into three parts. In the first is set down the preparation for salvation; in the second, the promise of salvation, chapter 60: Arise, be enlightened; in the third, the great discernment of the salvation conferred, chapter 63: Who is this. The first into two. In the first is set down the preparation on the part of the one receiving salvation; in the second, on the part of the one saving, chapter 59: Behold, it is not shortened. The first into two. In the first he gives the wholesome counsel of preparation; in the second he excludes the vain remedy, chapter 58: Cry, cease not. The first into two. In the first he sets down the diversity of those who receive the counsel, as regards the establishment of rewards; in the second, as regards the escape from dangers, chapter 57: the just man perishes. The first into three. In the first he sets down the counsel; in the second, the fruit of the counsel in those who receive it, Blessed is the man who does; in the third, the failure of salvation in those who despise it, all you beasts. Concerning the first he does two things. First he counsels the due preparation: keep judgment, you prelates, whose office it is to judge; do justice, you subjects, that is, every virtue, according as one is conformed to another by the precepts of the law. Micah 6: I will show you, O man, what is good. Second he promises the nearness of salvation: for near, that is, close, is my salvation, because you will be saved by me after the captivity, and my justice, as regards the enemies of whom I will avenge you. Above, 46: I have brought my justice near. Blessed is the man. Here he sets down the fruit of the counsel in those who receive it: and first he sets down its usefulness, setting down the fruit of fulfillment: blessed is the man who does, fulfilling in deed, who lays hold, vigorously undertaking. Psalm 111: blessed is the man who fears the Lord; and the manner of fulfilling, as regards ceremonial matters, keeping the sabbath: for the observance of the sabbath was moral as regards this, that rest is placed in God, and that one is at some time free for divine things by abstaining from other things; but it was ceremonial as regards the determination of the time. Now the seventh day was determined for them on account of the work of creation, than which nothing more worthy had yet preceded. For us, the first day, or the eighth, on account of the mystery of the resurrection, by which nature once founded is repaired for the better. Exodus 20: remember to keep holy the sabbath day. Jeremiah 17: keep your souls. And as regards moral matters, keeping the hands. Psalm 25: I will wash my hands among the innocent. Second he sets down the universality of its usefulness, and let him not say: and first he excludes the despair of certain ones who seemed unworthy, whether on account of a defect of lineage, because they were not of the race of Israel. Who adheres, keeping his precepts. By separation, not making me a partaker of the salvation promised to them. Romans 10: for there is no distinction of Jew and Greek: for the same is Lord of all. Or on account of a defect of the generative power: and let not the eunuch say: a dry tree, powerless to beget, as a dry tree is powerless to sprout. Proverbs 11: the just, like a flourishing leaf. Second he sets down the promise: for thus says the Lord. And first to them specially, as regards the eunuchs: they shall have kept, as regards the worship of religion; they shall have chosen, as regards obedience to the law; they shall have held fast, as regards the observance of the promise of abstaining from evils: within the walls, that is, a dwelling within the walls of my city; a better name, in that they shall be called my servants and holy ones; and than sons, as if they had begotten many sons. Wisdom 3: the eunuch who has not wrought. And as regards the strangers: and to sons, that is, I will give the privileges in which the Jews glory, that they may worship, as regards special worship, and love, as sons, that they may be as servants, and glory in his dominion. Above, 19: they shall worship the Lord. And these things indeed were fulfilled in the return of the people from the captivity; but more fully in the conversion of the nations to the faith of Christ, as the Gloss explains. Second, as regards all in general: every one who keeps. And concerning this he does two things. First he sets down the promise, by which he promises the restoration of the sacred place: to the holy mountain. Namely, as above, 1: come, let us go up to the mountain of the Lord. And as regards the acceptance of sacrifices: holocausts. Malachi 3: the sacrifice of Judah and Jerusalem shall be pleasing to God. Second he sets down the order of fulfillment: and first as regards the veneration of the temple: for my house. 2 Maccabees 3: the temple throughout the whole. John 2 and Matthew 21: my house shall be called a house of prayer. Second, as regards the gathering of the people: says the Lord, to him; he gathers Israel, the nations adhering to him. Psalm 146: the Lord, building up Jerusalem, will gather the dispersions of Israel. Note on that word, and I will give a better name, that the saints have a name, first from predestination. Above, 49: the Lord has called me from the womb; second, from divine attainment. 1 John 3: behold what manner of love or charity God the Father has given us, that we should be called, and should be, sons of God. Third, from the infusion of grace. Apocalypse 2: you have a name, and you hold my name. Fourth, from the renewal of the mind. In the same place, Apocalypse 2: I will give a stone. Also note, that the name of God is to be loved: first, because it is great, so as to be feared. Malachi 1: my name is great among the nations, says the Lord. Second, because it is holy, so as to be venerated. Luke 1: he who is mighty has done great things for me, and holy is his name. Third, because it is sweet, so as to be meditated upon. Above, 26: your name and your memorial are in the desire of the soul. Fourth, because it is abundant, so as to show mercy. Canticle 1: your name is oil poured out. Fifth, because it is efficacious, so as to obtain. John 15: whatsoever you shall ask the Father in my name, he will give you. Sixth, because it is powerful, so as to save. Acts 4: there is no other name under heaven whereby we must be saved. Seventh, because it is hidden, so as to be known. Proverbs 30: what is his name. All you beasts of the field. Here he threatens those who despise it with the failure of salvation: and first he designates the punishment of slaughter: all beasts, to devour, their corpses. Ezekiel 39: speak to every bird, to all. Second he sets down the fault: and first, of the prelates, as regards their failure in government and in foreseeing dangers. Watchmen: for prelates are set up to guard the people from dangers, as a watchman guards against enemies: they have not known, to foresee dangers. Matthew 15: let them alone: they are blind leaders of the blind. In the correction of vices, all of them dogs. To bark, against vices. Psalm 37: but I, as a deaf man, heard not, and as a dumb man, not opening his mouth. In the admonition of things to be done, seeing vain things, promising them prosperous things when adverse things were imminent; and thus nourishing them in sins. Ezekiel 22: her prophets daubed them. In the plundering of goods, and most shameless dogs; as if, without any restraint of shame, despoiling their subjects of their goods, and never satisfied. Psalm 58: they shall suffer hunger like dogs. And as regards their failure in the perfection of knowledge: they, the shepherds, understanding, of the law and the prophets. Proverbs 1: the intelligent man shall possess the helm. Psalm 81: they have not known nor understood; they walk on in darkness. Second, the fault of the subjects, or of all in common: and first, as regards their own will, which pertains to pride: all, into his own way. Jeremiah 16: every one walks. Second, as regards their covetousness, which pertains to avarice: every one. Jeremiah 6: from the least even to the greatest, all are given to avarice. Third, as regards pleasure, which pertains to the concupiscence of the flesh: come. And it shall be; that is, if today we rejoice in such things, tomorrow much more. Above, 22: and behold joy and gladness, killing calves and slaying rams, eating flesh and drinking wine.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“The Lord God, which gathereth the outcasts of Israel, saith,.... Not the outcasts of literal Israel, the captives in Babylon, and elsewhere; but of spiritual Israel, and who are cast out, not by the Lord, but by the men of the world; who cast out their names as evil, who call them outcasts, and account them the offscouring of all things, Jer 30:17 or rather this character of them may represent what they appear to be in a state of nature, when they seem to be neglected, and not taken notice of by the Lord, as if they were not his people, or beloved by him; and are like the infant cast out into the open field to the loathing of its person; and yet such as these the Lord looks upon, takes notice of, and gathers in by an effectual calling. The Targum renders it, "the scattered of Israel"; and so the Septuagint, Vulgate Latin, Syriac, and Arabic versions; who, while unregenerate, are in a state of distance and alienation from God; are without God and Christ, and destitute of the Spirit; aliens from the people of God; wandering out of the way of God; are like lost sheep, scattered abroad by the fall of Adam, and their own actual transgressions: now the Lord God is the gatherer of these; which agrees with Christ, as the surety that engaged to look them up, and bring them in; and as he is a shepherd that gathers the lambs in his arms; and as he is the Saviour that came to seek and save that which was lost; and who, in consequence of having redeemed his people, gathers them by his Spirit and grace, through the ministry of the word; see Joh 10:16, it may be here meant of God the Father, whose purpose, plan, and contrivance, it was to gather together all his elect in one, even in Christ; and whose promise it is, that to him should the gathering of the people be; and who set him up as an ensign for that purpose, Eph 1:10 he now says: yet will I gather others to him besides those that are gathered unto him; that is, to Israel; either to Christ, to whom these outcasts and scattered ones belong, who is sometimes called Israel, Isa 49:3, or to the church of God, whither they are brought when gathered, as in Isa 56:5, this is done in the effectual calling, when God's elect are called and gathered out of the world, among whom they have been, and are brought to Christ as their Saviour; as the Lord their righteousness; as the Mediator of the new covenant; and to his blood for pardon, justification, and salvation; and as the ark where they only can find rest for their souls; and as their King, to whom they become subject; and so they are gathered into the church as to a fold and good pasture. Now great numbers of these, both among the Jews and Gentiles, were gathered in at the first preaching of the Gospel, in the first times of the Gospel dispensation; and it is here promised that others besides them should be gathered in, even all that remain of the election of grace uncalled; the rest of those that the Father has given to Christ; the residue of those he has redeemed by his blood; such of the children of God as are yet scattered abroad, even all the remainder of the Lord's people, whether Jews or Gentiles; which will be fulfilled in the latter day, when the forces and fulness of the Gentiles shall be brought in, and the nation of the Jews converted at once. The words may be rendered, "yet will I gather unto him his that are to be gathered" (s); the other sheep uncalled; as many as are ordained unto eternal life; not one shall be lost or left behind. Kimchi mentions it as an exposition of his father's, "after I have gathered the outcasts of Israel; yet will I gather, against them that are gathered, others against his gathered ones, and they are Gog and Magog;'' to which sense, he says, the following verse inclines: but much better is the sense of Aben Ezra, "yet, will I gather proselytes to the gathered of Israel;'' for his "gathered ones", he says, refers to Israel. But it is best of all to interpret it of the nations gathered and added to the Christian churches in the times of Constantine, who before had been treated as outcasts, and persecuted for their profession of Christ; and of the conversion of various other people, as the Goths, Vandals, &c. in later ages. So Vitringa. (s) "adhuc congregabo, super eum congregatos ejus", Pagninus, Montanus; "congregandos ejus", Forerius, Grotius.”
Source
1871
A.D.
1871
“Jehovah will not only restore the scattered outcasts of Israel (Isa 11:12; Psa 147:2) to their own land, but "will gather others ('strangers') to him (Israel), besides those gathered" (Margin, "to his gathered"; that is, in addition to the Israelites collected from their dispersion), (Joh 10:16; Eph 1:10; Eph 2:19).”
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“The expression "saying of the Lord" (Ne'um Jehovah), which is so solemn an expression in itself, and which stands here at the head of the following declaration, is a proof that it contains not only something great, but something which needs a solemn confirmation because of its strangeness. Not only is there no ground for supposing that Gentiles who love Jehovah will be excluded from the congregation; but it is really Jehovah's intention to gather some out of the heathen, and add them to the assembled diaspora of Israel. "Word of the Lord, Jehovah: gathering the outcasts of Israel, I will also gather beyond itself to its gathered ones." We only find ה נאם at the commencement of the sentence, in this passage and Zac 12:1. The double name of God, Adonai Jehovah, also indicates something great. עליו (to it) refers to Israel, and לנקבּציו is an explanatory permutative, equivalent to על־נקבציו; or else על denotes the fact that the gathering will exceed the limits of Israel (cf., Gen 48:22), and ל the addition that will be made to the gathered ones of Israel. The meaning in either case remains the same. Jehovah here declares what Jesus says in Joh 10:16 : "Other sheep I have which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold and one Shepherd:" "Jehovah one, and His name one," as it is expressed in Zac 14:9. Such as the views and hopes that have grown up out of the chastisement inflicted by their captivity. God has made it a preparatory school for New Testament times. It has been made subservient to the bursting of the fetters of the law, the liberation of the spirit of the law, and the establishment of friendship between Israel and the Gentile world as called to one common salvation.”
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.