Hebrews 12:14-16

14Pursue peace with everyone, and the holiness without which no one will see the Lord. 15See to it that no one fails to obtain the grace of God; that no root of bitterness springs up and causes trouble, and through it many become defiled. 16See to it that no one becomes like Esau, an immoral and godless person, who sold his birthright for a single meal.