Genesis 25:29-34

When Jacob had cooked stew, Esau came in from the field and he was famished; and Esau said to Jacob, “Please let me have a swallow of that red stuff there, for I am famished.” Therefore his name was called Edom. But Jacob said, “First sell me your birthright.” Esau said, “Behold, I am about to die; so of what use then is the birthright to me?” And Jacob said, “First swear to me”; 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 on his way. Thus Esau despised his birthright.