Genesis 25:29-34 NIV

29 Once when Jacob was cooking some stew, Esau came in from the open country, famished. 

30 He said to Jacob, “Quick, let me have some of that red stew!I’m famished!” (That is why he was also called Edom.

31 Jacob replied, “First sell me your birthright.”

32 “Look, I am about to die,” Esau said. “What good is the birthright to me?”

33 But Jacob said, “Swear to me first.” So he swore an oath to him, selling his birthright to Jacob.

34 Then Jacob gave Esau some bread and some lentil stew. He ate and drank, and then got up and left.

So Esau despised his birthright.

Hebrews 11:6 NIV

6 And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him.

Philippians 1:6 NIV

6 being confident of this, that he who began a good work in you will carry it on to completion until the day of Christ Jesus.