I (Jesus) tell you: if you are angry with your brother you will be brought to trial, if you call your brother ‘You good-for-nothing!’ you will be brought before the Council (Judges), BUT... if you call (judge) your brother a worthless fool "you will be in danger" of going to the fire of hell.

So if you are about to offer your gift (service, prayer) to God at the altar and there you remember that your brother has something against you, leave your gift there in front of the altar....

Go at once and make peace with your brother, and THEN... come back and offer your gift to God. (Matthew 5:22-24)