Hebrews 12:15-17

looking carefully lest there be any man that falleth short of the grace of God; lest any root of bitterness springing up trouble you, and thereby the many be defiled; lest there be any fornicator, or profane person, as Esau, who for one mess of meat sold his own birthright. For ye know that even when he afterward desired to inherit the blessing, he was rejected; for he found no place for a change of mind in his father, though he sought it diligently with tears.