Genesis 25:26-34

26 After that, his brother came out, and his hand had hold on Esav's heel. He was named Ya`akov. Yitzchak was sixty years old when she bore them.
27 The boys grew. Esav was a skillful hunter, a man of the field. Ya`akov was a quiet man, living in tents.
28 Now Yitzchak loved Esav, because he ate his venison. Rivka loved Ya`akov.
29 Ya`akov boiled stew. Esav came in from the field, and he was famished.
30 Esav said to Ya`akov, "Please feed me with that same red stew, for I am famished." Therefore his name was called Edom.
31 Ya`akov said, "First, sell me your birthright."
32 Esav said, "Behold, I am about to die. What good is the birthright to me?"
33 Ya`akov said, "Swear to me first." He swore to him. He sold his birthright to Ya`akov.
34 Ya`akov gave Esav bread and stew of lentils. He ate and drank, rose up, and went his way. So Esav despised his birthright.