Paul refers to two kinds of church—public and domestic. One in which everyone assembles, he calls public. The other, in which people gather together through friendship, he calls domestic. Any place where a presbyter celebrates the solemn rites is called a church.
"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.
[AD 384] Ambrosiaster on 1 Corinthians 16:19