Matthew 5:22-24

22But I tell you that anyone who is angry with his brother1 will be subject to judgment. Again, anyone who says to his brother, ‘Raca,’2 will be subject to the Sanhedrin.3 But anyone who says, ‘You fool!’ will be subject to the fire of hell.4

23So if you are offering your gift at the altar and there remember that your brother has something against you, 24leave your gift there before the altar. First go and be reconciled to your brother; then come and offer your gift.