Romans 9:10-16

10And not only this; but when Rebecca also had conceived by one, even by our father Isaac; 11(For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth;) 12It was said unto her, The elder shall serve the younger. 13As it is written, Jacob have I loved, but Esau have I hated.

14What shall we say then? Is there unrighteousness with God? God forbid. 15For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion. 16So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy.