Ephesians 4:30-31 "And grieve not the Holy Spirit of God, whereby ye are sealed unto the day of redemption. Let all bitterness, and wrath, and anger, and clamour, and evil speaking be put way from you, with all malice."
Matthew 5:22: "But I say to you that everyone who is angry with his brother shall be guilty before the court, and whoever says to his brother, you good for nothing, shall be guilty before the supreme court, and whoever says, you fool, shall be guilty enough to go into the fiery hell."