John Calvin Commentary Romans 11:27

"And this is my covenant unto them, When I shall take away their sins." — Romans 11:27 (ASV)

And, this is my covenant with them, etc. Though Paul, by the last prophecy of Isaiah, briefly touched on the office of the Messiah to remind the Jews what was especially to be expected 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.

This addition also tends to confirm the subject at hand. What Paul said about the conversion of such a stubborn and obstinate people 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 nothing more to do with His apostate people until He should remit the crime of faithlessness, as well as their other sins.