Matthew 5:21-22
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21"You have heard that it was said to the men of old, `You shall not kill; and whoever kills shall be liable to judgment.' 22But I say to you that every one who is angry with his brother shall be liable to judgment; whoever insults his brother shall be liable to the council, and whoever says, `You fool!' shall be liable to the hell of fire.
Matthew 5:21-22 (RSV)