Hebrews 12:14-17

14Pursue peace with everyone, as well as holiness, without which no one will see the Lord. 15See to it that no one falls short of the grace of God, and that no root of bitterness1 springs up to cause trouble and defile many. 16See to it that no one is sexually immoral, or is godless like Esau, who for a single meal sold his birthright. 17For you know that afterward, when he wanted to inherit the blessing, he was rejected. He could find no ground for repentance, though he sought the blessing with tears.