Likewise greet the church that is in their house. Salute my wellbeloved Epaenetus, who is the firstfruits of Achaia unto Christ. The Church that is in their house - In these primitive times no such places existed as those which we now term churches; the word always signifying the congregation or assembly of believers, and not the place they assembled in. See the term defined at the end of the notes, Matthew 16:28 (note).
Epenetus - the first fruits of Achaia - In 1 Corinthians 16:15, the house or family of Stephanas is said to be the first fruits of Achaia: how then can it be said here, that Epenetus was the first fruits, or first person who had received the Gospel in that district? Ans. - Epenetus might have been one of the family of Stephanas; for it is not said that Stephanas was the first fruits, but his house or family; and there can be no impropriety in supposing that one of that house or family was called Epenetus; and that this person, being the only one of the family now at Rome, might be mentioned as the first fruits of Achaia; that is, one of that family which first received the Gospel in that country. This would rationally account for the apparent difficulty, were we sure that Αχαιας, of Achaia, was the true reading: but this is more than doubtful, for Ασιας, of Asia, is the reading of ABCDEFG, some others; the Coptic, Ethiopic, Armenian, Vulgate, and Itala; and some of the chief of the fathers. On this evidence Griesbach has admitted it into the text. Yet the other reading is sufficiently natural, for the reasons already assigned.