And, this is my covenant with them, etc. Though Paul, by the last prophecy of Isaiah, briefly touched on the office of the Messiah, in order to remind the Jews what was to be expected especially from him, he further adds these few words from Jeremiah, expressly for the same purpose; for what is added is not found in the former passage. [1] This also tends to confirm the subject in hand; for what he said of the conversion of a people who were so stubborn and obstinate, might have appeared incredible: he therefore removes this stumblingblock, by declaring that the covenant included a gratuitous remission of sins. For we may gather from the words of the Prophet, -- that God would have no more to do with his apostate people, until he should remit the crime of perfidy, as well as their other sins.

Footnotes

1 - The former part of it is, "This is my covenant," but not the latter, "when I shall take away their sins." Some suppose that this is taken from Isaiah 27:9, where we find this phrase in the Septuagint, "When I shall take away his sins," ten hamartian autou: but the Hebrew is somewhat different and farther from the form of the sentence here. We must therefore consider it as an abridgment of what is contained in Jeremiah 31:33, and quoted in Hebrews 8:10. -- Ed.

For this is my covenant - This expression is found immediately following the other in Isaiah 59:21. But the apostle connects with it a part of another promise taken from Jeremiah 31:33-34; or rather he abridges that promise, and expresses its substance, by adding "when I shall take away their sins." It is clear that he intended to express the general sense of the promises, as they were well known to the Jews, and as it was a point concerning which he did not need to argue or reason with them, that God had made a covenant with them, and intended to restore them if they were cast off, and should then repent and turn to him. The time and manner in which this shall be, is not revealed. It may be remarked, however, that that passage does not mean that the Redeemer shall come personally and preach to them, or re-appear for the purpose of recalling them to himself; nor does it mean that they will be restored to the land of their fathers. Neither of these ideas is contained in the passage. God will doubtless convert the Jews, as he does the Gentiles, by human means, and in connection with the prayers of his people; so that the Gentiles shall yet repay the toil and care of the ancient Jews in preserving the Scriptures, and preparing the way for the Messiah; and both shall rejoice that they were made helps in spreading the knowledge of the Messiah.

For this is my covenant unto them, when I shall take away their sins - The reader on referring to Isaiah 59:20, Isaiah 59:21, will find that the words of the original are here greatly abridged. They are the following: -
And the Redeemer shall come to Zion, and unto them that turn from transgression in Jacob, saith the Lord. As for me, this is my covenant with them, saith the Lord, My Spirit that is upon thee, and my words which I have put in thy mouth, shall not depart out of thy mouth, nor out of the mouth of thy seed, nor out of the mouth of thy seed's seed, saith the Lord, from henceforth and for ever.
For the manner in which St. Paul makes his quotation from Scripture, see the observations at the end of the preceding chapter, (Romans 10:21 (note), Part I.). The whole of these two verses should be read in a parenthesis, as I have marked them in the text; for it is evident that the 25th verse should be immediately connected with the 28th.
It may not be amiss to subjoin here a collection of those texts in the Old Testament that seem to point out a restoration of the Jewish commonwealth to a higher degree of excellence than it has yet attained. Isaiah 2:2-5; Isaiah 19:24, Isaiah 19:25; Isaiah 25:6, etc.; Isaiah 30:18, Isaiah 30:19, Isaiah 30:26; Isaiah 60:1-22; Isaiah 65:17-25; Jeremiah 31:10-12; Jeremiah 46:27, Jeremiah 46:28; Ezekiel 20:34, Ezekiel 20:40, etc.; Ezekiel 28:25, Ezekiel 28:26; Ezekiel 34:20, etc.; Ezekiel 36:8-16; Ezekiel 37:21-28; Ezekiel 39:25, etc.; Joel 3:1, Joel 3:2, Joel 3:17, Joel 3:20, Joel 3:21; Amos 9:9-15; Obadiah 1:17, Obadiah 1:21; Micah 4:3-7; Micah 7:18-20; Zephaniah 3:19, Zephaniah 3:20.

For this is my covenant unto them,.... This is what God has promised to them in covenant, and he will be as good as his word; his covenant will never be broken, it will always remain sure and inviolable; so that there is not only a possibility, and a probability, but even a certainty, of the call and conversion of the Jews; which promise and covenant will have their accomplishment,
when I, saith the Lord,
shall take away their sins: some think that the apostle alludes to Jeremiah 31:34; others, that he takes this passage out of Isaiah 27:9; where in the Septuagint version the selfsame phrase is used; though it may be no citation, or reference, but the apostle's own words, explaining what is meant by "turning away ungodliness from Jacob", Romans 11:26; and as before; regards not the taking away of their sins by the sacrifice of Christ, which is done already, and is what the blood of bulls and goats could not do; but of the removing of their sins from themselves, from their consciences, by the application of the blood of Christ, and the imputation of his righteousness.

For--rather, "and" (again); introducing a new quotation.
this is my covenant with them--literally, "this is the covenant from me unto them."
when I shall take away their sins--This, we believe, is rather a brief summary of Jeremiah 31:31-34 than the express words of any prediction, Those who believe that there are no predictions regarding the literal Israel in the Old Testament, that stretch beyond the end of the Jewish economy, are obliged to view these quotations by the apostle as mere adaptations of Old Testament language to express his own predictions [ALEXANDER on Isaiah, &c.]. But how forced this is, we shall presently see.