Hebrews 12:15-17

Godbey(i) 15 looking diligently lest any one may fail from the grace of God; lest any root of bitterness springing up may trouble you, and through it many may be defiled; 16 lest any one may be a fornicator, or a profane person, as was Esau, who for one morsel sold his birthright. 17 For you know that, wishing to inherit the blessing, he was rejected: for he found no place of repentance even though having sought it diligently with tears.