Matthew 5:21-24

21Ye have heard that it was said to the ancients, Thou shalt not kill; but whosoever shall kill shall be subject to the judgment.

22But I say unto you, that every one that is lightly angry with his brother shall be subject to the judgment; but whosoever shall say to his brother, Raca, shall be subject to [be called before] the sanhedrim; but whosoever shall say, Fool, shall be subject to the penalty of the hell of fire.

23If therefore thou shouldest offer thy gift at the altar, and there shouldest remember that thy brother has something against thee,

24leave there thy gift before the altar, and first go, be reconciled to thy brother, and then come and offer thy gift.