Hebrews 12:14-17 NLT

14 Work at living in peace with everyone, and work at living a holy life, for those who are not holy will not see the Lord.
15 Look after each other so that none of you fails to receive the grace of God. Watch out that no poisonous root of bitterness grows up to trouble you, corrupting many.
16 Make sure that no one is immoral or godless like Esau, who traded his birthright as the firstborn son for a single meal.
17 You know that afterward, when he wanted his father’s blessing, he was rejected. It was too late for repentance, even though he begged with bitter tears.