Genesis 25:26, 33-34

Afterward his brother came out, and his hand took hold of Esau’s heel; so his name was called Jacob. Isaac was sixty years old when she bore them.

Then Jacob said, “Swear to me as of this day.” So he swore to him, and sold his birthright to Jacob. And Jacob gave Esau bread and stew of lentils; then he ate and drank, arose, and went his way. Thus Esau despised his birthright.