Hebrews 12:14 - 12:17
14 Pursue peace with all men, and the sanctification without which no one will see the Lord, 15 seeing to it that no one falls short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled; 16 that also there be no sexually immoral or godless person like Esau, who sold his own birthright for a single meal. 17 For you know that even afterwards, when he desired to inherit the blessing, he was rejected, for he found no place for repentance, though he sought for it with tears.