Charles Ellicott Commentary Romans 11:27

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

The second part of the quotation, “For (rather, and), this is my covenant with them,” etc., appears to be taken from the LXX version of Isaiah 27:9. The connecting-links between the two are the removing of transgression from Jacob, and the form of the phrase, “This is my covenant with them.” (“This is his blessing,”Isaiah 27:9, LXX.)