Matthew 5:21-22

21 Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
22 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,a shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.