Hebrews 12:14-17

14Follow peace with all men, and holiness, without which no man shall see the Lord: 15Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and by it many be defiled;1 16Lest there be any immoral, or profane person, as Esau, who for one meal sold his birthright. 17For ye know that afterward, when he would have inherited the blessing, he was rejected: for he found no place of repentance, though he sought it carefully with tears.2