Genesis 25:26

25:26 When his brother came out with his hand clutching Esau’s heel, they named him Jacob. Isaac was sixty years old when they were born.

Genesis 25:33-34

25:33 But Jacob said, “Swear an oath to me now.” So Esau swore an oath to him and sold his birthright to Jacob.

25:34 Then Jacob gave Esau some bread and lentil stew; Esau ate and drank, then got up and went out. So Esau despised his birthright.