Romans 9:8-18

That is, it is not the children of the flesh who are children of God, but the children of the promise are regarded as descendants. For this is the word of promise: “At this time I will come, and Sarah will have a son.” And not only that, but there was also Rebekah, when she had conceived twins by one man, our father Isaac; for though the twins were not yet born and had not done anything good or bad, so that God’s purpose according to His choice would stand, not because of works but because of Him who calls, it was said to her, “The older will serve the younger.” Just as it is written: “Jacob I have loved, but Esau I have hated.” What shall we say then? There is no injustice with God, is there? Far from it! For He says to Moses, “I will have mercy on whomever I have mercy, and I will show compassion to whomever I show compassion.” So then, it does not depend on the person who wants it nor the one who runs, but on God who has mercy. For the Scripture says to Pharaoh, “For this very reason I raised you up, in order to demonstrate My power in you, and that My name might be proclaimed throughout the earth.” So then He has mercy on whom He desires, and He hardens whom He desires.