Didache 14
But every Lord's day gather yourselves together, and break bread, and give thanksgiving after having confessed your transgressions, that your sacrifice may be pure. But let no one that is at variance with his fellow come together with you, until they be reconciled, that your sacrifice may not be profaned. For this is that which was spoken by the Lord:
In every place and time offer to me a pure sacrifice; for I am a great King, says the Lord, and my name is wonderful among the nations.
Greek
Κατὰ κυριακὴν δὲ κυρίου συναχθέντες κλάσατε ἄρτον καὶ εὐχαριστήσατε, προεξομολογησάμενοι τὰ παραπτώματα ὑμῶν, ὅπως καθαρὰ ἡ θυσία ὑμῶν ᾖ. πᾶς δὲ ἔχων τὴν ἀμφιβολίαν μετὰ τοῦ ἑταίρου αὐτοῦ μὴ συνελθέτω ὑμῖν, ἕως ὁ??ʼ διαλλαγῶσιν, ἵνα μὴ κοινωθῇ ἡ θυσία ὑμῶν. αὕτη γάρ ἐστιν ἡ ῥηθεῖσα ὑπὸ κυρίον: Ἐν παντὶ τόπῳ καὶ χρόνῳ προσφέρειν μοι θυσίαν καθαράν. ὅτι βασιλεὺς μέγας εἰμί, λέγει κύριος, καὶ τὸ ὄνομά μου θαυμαστὸν ἐν τοῖς ἔθνεσι.