Matthew 5:21-22

You have heard that it was said to them of old: Thou shalt not kill. And whosoever shall kill, shall be in danger of the judgment.

But I say to you, that whosoever is angry with his brother, shall be in danger of the judgment. And whosoever shall say to his brother, Raca, shall be in danger of the council. And whosoever shall say, Thou fool, shall be in danger of hell fire.