Matthew 5:22-24

22But I tell you, everyone who is angry with his brother or sister will be subject to judgment. Whoever insults his brother or sister will be subject to the court. Whoever says, ‘You fool!’ will be subject to hellfire.

23So if you are offering your gift on the altar, and there you remember that your brother or sister has something against you,

24leave your gift there in front of the altar. First go and be reconciled with your brother or sister, and then come and offer your gift.