Romans 9:8

5 whose are the fathers, and of whom is Christ as concerning the flesh, who is over all, God blessed for ever. Amen.

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--

11 for [the children] being not yet born, neither having done anything good or bad, that the purpose of God according to election might stand, not of works, but of him that calleth,