Genesis 25:31-34 NIV

31 Jacob replied, "First sell me your birthright.1"

References for Genesis 25:31

32 "Look, I am about to die," Esau said. "What good is the birthright to me?"
33 But Jacob said, "Swear2 to me first." So he swore an oath to him, selling his birthright3 to Jacob.

References for Genesis 25:33

34 Then Jacob gave Esau some bread and some lentil stew.4 He ate and drank, and then got up and left. So Esau despised his birthright.

References for Genesis 25:34