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The Sermon on the Mount; The Beatitudes
21“You have heard that the ancients were told, ‘You shall not murder,’ and ‘Whoever commits murder shall be answerable to the court.’ 22But I say to you that everyone who is angry with his brother shall be answerable to the court; and whoever says to his brother, ‘You good-for-nothing,’ shall be answerable to the supreme court; and whoever says, ‘You fool,’ shall be guilty enough to go into the fiery hell.
Matthew 5:21-22 (NASB)