Romans 9:10-16

And not only so; but Rebecca also having conceived by one, even by our father Isaac— 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, it was said unto her, The elder shall serve the younger. Even as it is written, Jacob I loved, but Esau I hated. What shall we say then? Is there unrighteousness with God? God forbid. For he saith to Moses, I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion. So then it is not of him that willeth, nor of him that runneth, but of God that hath mercy.