Genesis 25:31-33

Young's Literal Translation

³¹ and Jacob saith, `Sell to-day thy birthright to me.'

³² And Esau saith, `Lo, I am going to die, and what is this to me -- birthright?'

³³ and Jacob saith, `Swear to me to-day:' and he sweareth to him, and selleth his birthright to Jacob;