Matthew 5:21-24 NIV
“You have heard that it was said to the people long ago, ‘You shall not murder, and anyone who murders will be subject to judgment.’ But I tell you that anyone who is angry with a brother or sister will be subject to judgment. Again, anyone who says to a brother or sister, ‘ Raca ,’ is answerable to the court. And anyone who says, ‘You fool!’ will be in danger of the fire of hell.
“Therefore, if you are offering your gift at the altar and there remember that your brother or sister has something against you, leave your gift there in front of the altar. First go and be reconciled to them; then come and offer your gift.
NIV: New International Version