Romans 9:10

7 And they are not all children because they are the seed of Abraham; but, In Isaac will your seed be named.

8 That is, it is not the children of the flesh, but the children of God's undertaking, who are named as the seed.

9 For this is the word of God's undertaking, At this time will I come, and Sarah will have a son.

10 And not only so, but Rebecca being about to have a child by our father Isaac--

11 Before the children had come into existence, or had done anything good or bad, in order that God's purpose and his selection might be effected, not by works, but by him whose purpose it is,

12 It was said to her, The older will be the servant of the younger.

13 Even as it is said, I had love for Jacob, but for Esau I had hate.