Genesis 25:29-34

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. Then Jacob gave Esau bread and vegetable soup, and he ate and drank, and then left. So Esau showed how little he cared about his rights as the firstborn son.