John Chrysostom

"Likewise greet the Church that is in their house." For she had been so estimable as even to make their house a Church, both by making all in it believers, and because they opened it to all strangers. For he was not in the habit of calling any houses Churches, save where there was much piety, and much fear of God deeply rooted in them. And on this ground he said to the Corinthians also, "Salute Aquila and Priscilla, with the Church that is in their house." (1 Cor. xvi. …

Homily on Romans 30 ↗

Theophylact of Ohrid

So virtuous were they that all their household members became believers, for he called them a church. He also called them this on account of their hospitality, for a house is called a church when exemplary piety and virtue are found in it. Let those leading a married life understand that the marital union is no hindrance to virtue for them. A great thing it is to be beloved of Paul, who knew how to love with discernment and not without reason. …

Commentary on Romans ↗

Thomas Aquinas

Then he wants another person joined to him by love to be greeted, saying: greet Epenetus, my beloved, who is the firstfruits of Asia in Christ. This lent him great dignity: you have come to the assembly of the firstborn, who are enrolled in heaven (Heb 12:23). But at that time he was in Rome.

Commentary on Romans ↗