Hebrews 12:14-16 New King James Version (NKJV)

14. Pursue peace with all people, and holiness, without which no one will see the Lord:

15. looking carefully lest anyone fall short of the grace of God; lest any root of bitterness springing up cause trouble, and by this many become defiled;

16. lest there be any fornicator or profane person like Esau, who for one morsel of food sold his birthright.

Hebrews 12