Romans 9:10

8That is, it is not the children of the flesh who are children of God, but the children of the promise are counted as heirs.

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

10Not only so, but Rebekah also conceived by one, by our father Isaac.

11For 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 who calls,

12it was said to her, “The elder will serve the younger.”