Once when Jacob was cooking a stew, Esau came in from the field, and he was famished.
Esau said to Jacob, “Let me eat some of that red stuff, for I am famished!” (Therefore he was called Edom.) Jacob said, “First sell me your birthright.” Esau said, “I am about to die; of what use is a birthright to me?”
Jacob said, “Swear to me first.” So he swore to him, and sold his birthright to Jacob. Then Jacob gave Esau bread and lentil stew, and he ate and drank, and rose and went his way. Thus Esau despised his birthright…
When Esau was forty years old, he married Judith daughter of Beeri the Hittite, and Basemath daughter of Elon the Hittite; and they made life bitter for Isaac and Rebekah.