Verse

Romans 9:8

A church father on this verse
"Nor are all also sons because they are the seed of Abraham." This, evidently, was already being signified then in Abraham, when, though he had many sons — whom the Apostle calls sons of the flesh — the posterity of his seed was placed in Isaac alone, who was the son of the promise. And so now too, those who after the…
Origen of Alexandria, 3th c. — COMMENTARY ON THE EPISTLE TO THE ROMANS
Original

8That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.

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In context

6Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:

7Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.

Romans 9:8

9For this is the word of promise, At this time will I come, and Sarah shall have a son.

10And not only this; but when Rebecca also had conceived by one, even by our father Isaac;

Read all of Romans 9