Romans 9:6-13

Now it is not as though the word of God has failed, because not all who are descended from Israel are Israel. Neither is it the case that all of Abraham’s children are his descendants. On the contrary, your offspring will be traced through Isaac. That is, it is not the children by physical descent who are God’s children, but the children of the promise are considered to be the offspring. For this is the statement of the promise: At this time I will come, and Sarah will have a son. And not only that, but Rebekah conceived children through one man, our father Isaac. For though her sons had not been born yet or done anything good or bad, so that God’s purpose according to election might stand — not from works but from the one who calls — she was told, The older will serve the younger. As it is written: I have loved Jacob, but I have hated Esau.