Assemble on the Lord's Day, and break bread and offer the Eucharist; but first make confession of your faults, so that your sacrifice may be a pure one. Anyone who has a difference with his fellow is not to take part with you until they have been reconciled, so as to avoid any profanation of your sacrifice. For this is the offering of which the Lord has said, Everywhere and always bring me a sacrifice that is undefiled, for I am a great king, says the Lord, and my name is the wonder of the nations.

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The Didache means The Teaching of the Apostles and was written as norms for the Church. Scholars have dated from early in the second half of the first century.

From:Crossing the Tiber by Stephen K. Ray, 1997