Hebrews 12:14-16

Let your desire be for peace with all men, and to be made holy, without which no man may see the Lord; Looking with care to see that no man among you in his behaviour comes short of the grace of God; for fear that some bitter root may come up to be a trouble to you, and that some of you may be made unclean by it; And that there may not be any evil liver, or any man without respect for God, like Esau, who let his birthright go for a plate of food.