Romans 9:8 ASV

⁶  But `it is' not as though the word of God hath come to nought. For they are not all Israel, that are of Israel:

⁷  neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called.

⁸  That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.

⁹  For this is a word of promise, According to this season will I come, and Sarah shall have a son.

¹⁰  And not only so; but Rebecca also having conceived by one, `even' by our father Isaac--