Didache 14

1But on the Lord’s own day, when you have gathered together, break bread and give thanks, having first confessed your transgressions, so that your sacrifice may be pure.

2But let no one who has a dispute with his companion come together with you until they are reconciled, so that your sacrifice may not be defiled.

3For this is what was spoken by the Lord: “In every place and time offer me a pure sacrifice, because I am a great King,” says the Lord, “and my name is marvelous among the nations.”