Genesis 25:23-26

And YAHWEH answered her, saying, “The two sons in your womb will become two nations, and the two peoples within you will become rivals. One people will become stronger than the other, and the older will serve the younger.” And when the time came for Rebekah to give birth, sure enough, she had twins! The first one came out reddish and covered with hair like a hairy garment; so they named him Esau. And his brother came out with his hand grasping Esau’s heel; so, they named him Jacob. Isaac was sixty when the twins were born.