Theodoret of Cyrus: Household Conspicuous in Piety is a Church

He compliments Philemon by calling him fellow worker, and he associates with him his partner as one who shares the faith; she would probably have opposed the letter's contents had she been passed over. Archippus had been entrusted with their instruction: he wrote about him to the Colossians, "Say to Archippus, Be careful to discharge the ministry you received in the Lord." He included him in the exhortation, and as well as these people the whole household, which he called a church, for being conspicuous for piety, so that even the servants, being dignified by the apostle's reference, should prove to be fellow workers in the exhortation.

- Theodoret of Cyrus (around A.D. 393 to around A.D. 457), Commentary on Philemon, in Theodoret of Cyrus, Commentary on the Letters of St. Paul, Volume 2, p. 261 (2001), Robert C. Hill translator.