Genesis 25:33 KJV
And Jacob said, Swear to me this day; and he sware unto him: and he sold his birthright unto Jacob.
Genesis 25:33, King James Version
In context
32 And Esau said, Behold, I am at the point to die: and what profit shall this birthright do to me?
33 And Jacob said, Swear to me this day; and he sware unto him: and he sold his birthright unto Jacob.
34 Then Jacob gave Esau bread and pottage of lentiles; and he did eat and drink, and rose up, and went his way: thus Esau despised his birthright.