Genesis 25:32-34

And Esau said, Behold, I am about to die: and what profit shall the birthright do to me? And Jacob said, Swear to me first; and he sware unto him: and he sold his birthright unto Jacob. And Jacob gave Esau bread and pottage of lentils; and he did eat and drink, and rose up, and went his way: so Esau despised his birthright.