Genesis 25:27-34

When the boys grew up, Esau became a skilled hunter, a man of the open fields, but Jacob was an even-tempered man, living in tents. Isaac loved Esau because he had a taste for fresh game, but Rebekah loved Jacob. Now Jacob cooked some stew, and when Esau came in from the open fields, he was famished. So Esau said to Jacob, “Feed me some of the red stuff – yes, this red stuff – because I’m starving!” (That is why he was also called Edom.) But Jacob replied, “First sell me your birthright.” “Look,” said Esau, “I’m about to die! What use is the birthright to me?” But Jacob said, “Swear an oath to me now.” So Esau swore an oath to him and sold his birthright to Jacob. Then Jacob gave Esau some bread and lentil stew; Esau ate and drank, then got up and went out. So Esau despised his birthright.