Be ye angry, and sin not: let not the sun go down upon your wrath:
Ephesians 4:26
But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
Matthew 5:22
Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
1John 3:15