Genesis 25:31-34

Jacob answered, “First sell me your birthright (the rights of a firstborn).” Esau said, “Look, I am about to die [if I do not eat soon]; so of what use is this birthright to me?” Jacob said, “Swear [an oath] to me today [that you are selling it to me for this food]”; so he swore [an oath] to him, and sold him his birthright. Then Jacob gave Esau bread and lentil stew; and he ate and drank, and got up and went on his way. In this way Esau scorned his birthright. [Heb 12:15-17]