Didache 14
On the Lord's day, gather together, break bread, and give thanks, after you have confessed your transgressions, so that your sacrifice may be pure.
Anyone who has a dispute with his companion must not join you until they are reconciled, so that your sacrifice may not be defiled.
For this is what the Lord has spoken: "In every place and time offer me a pure sacrifice, because I am a great king, says the Lord, and my name is great among the nations" (Malachi 1:11, 1:14).
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.