“And in the very place where it was said to them, ‘You are not my people,’ there they will be called ‘sons of the living God.’”
26. I will call them my people which are not a people This is said with respect to the divorce, which God had already made with the people, by depriving them of all honor, so that they did not excel other nations.
Having explained the promise, and proved the divine sovereignty, the apostle here shows how the rejection of the Jews, and the taking in of the Gentiles, were foretold in the Old Testament, and therefore must needs be very well consistent with the promise made to the fathers under the Old Testament. It tends very much to the clearing of a truth to observe how the scripture is fulfilled in it.
Commenting on Romans 9:25-29
Esaias crieth concerning Israel,.... The apostle having produced proper testimonies in proof of the calling of the Gentiles, proceeds to mention others; showing, that some few of the Jews also were to be called, according to prophecy, founded upon divine predestination; which, though they are full proofs of the calling of some from among the Jews, yet at the same time suggest the casting off...