1 Peter 2:10

10Which in time past were not a people He brings for confirmation a passage from Hosea, and well accommodates it to his own purpose. For Hosea, after having in God’s name declared that the Jews were repudiated, gives them a hope of a future restoration. Peter reminds us that this was fulfilled in his own age; for the Jews were scattered here and there, as the torn members of a body; nay, they seemed to be no longer God’s people, no worship remained among them, they were become entangled in the corruptions of the heathens; it could not then be said otherwise of them, but that they were repudiated by the Lord. But when they are gathered in Christ, from no people they really become the people of God. Paul, in Romans 9:26, applies also this prophecy to the Gentiles, and not without reason; for from the time the Lord’s covenant was broken, from which alone the Jews derived their superiority, they were put on a level with the Gentiles. It hence follows, that what God had promised, to make a people of no people, belongs in common to both.

Which had not obtained mercy This was added by the Prophet, in order that the gratuitous covenant of God, by which he takes them to be his people, might be more clearly set forth; as though he had said, “There is no other reason why the Lord counts us his people, except that he, having mercy on us, graciously adopts us.” It is then God’s gratuitous goodness, which makes of no people a people to God, and reconciles the alienated. (25)