John Chrysostom

"All the Churches of Asia salute you." He is continually making the members combine and cleave together in one by means of the salutation. "Aquila and Priscilla salute you much in the Lord;-for with them he was lodging, being a tent-maker-"with the Church which is in their house." This thing too is no small excellency, that they had made their very house a Church.

Homily on 1 Corinthians 44 ↗

Theophylact of Ohrid

Members of Christ he unites through greeting, according to his constant custom. He stayed with them, because he himself was also occupied with tent-making (Acts 18:1–3). Note their virtue in that they made their house a church, having arranged in it gatherings of the faithful.

Commentary on 1 Corinthians ↗

Thomas Aquinas

All the brethren send you greetings. The Apostle mentions here what others do for the Corinthians. And concerning this he does two things. First, he mentions how they are greeted by others; secondly, he adds his greeting (v. 21). Concerning the first he does three things. First, he mentions how the whole church of Asia greets them together. Hence he says, the churches of Asia send greetings: "All the churches of Christ greet you" (Rom. 16:16). Secondly, how the friends of Paul greet them in particular. …

Commentary on 1 Corinthians ↗