Genesis 25:27-33

When the boys grew up, Esau became a skilled hunter. He loved to be out in the fields. But Jacob was a quiet man and stayed among the tents. Isaac loved Esau because he hunted the wild animals that Isaac enjoyed eating. But Rebekah loved Jacob. One day Jacob was boiling a pot of vegetable soup. Esau came in from hunting in the fields, weak from hunger. So Esau said to Jacob, “Let me eat some of that red soup, because I am weak with hunger.” (That is why people call him Edom.) But Jacob said, “You must sell me your rights as the firstborn son.” Esau said, “I am almost dead from hunger. If I die, all of my father’s wealth will not help me.” But Jacob said, “First, promise me that you will give it to me.” So Esau made a promise to Jacob and sold his part of their father’s wealth to Jacob.