Acts 18:7

a certain man's house, named Justus He used this house for the purposes of teaching and worship. We may suppose that for his own lodging, he still remained with Aquila and Priscilla. Some MSS. give the name Titus Justus to this man, and the double name is adopted in the Revised Version, but there is good authority for the received text.

one that worshipped God He was a Proselyte. The word is used of religious proselytes (Acts 13:43) and of devout Greeks (Acts 17:4). His house was therefore an appropriate place in which both Jews and Gentiles might meet, and to which Gentiles would be more ready to come than to that of a Jew by birth.

whose house joined hard to the synagogue It is likely that St Paul, though he came no more to the synagogue at Corinth, chose not to betake himself far away, because he would be ready to receive any of his brethren who might change their feelings and come to him. But we can see how, while his near neighbourhood gave opportunity for this, the meetings of those who came to the synagogue with those who were going to the house of Justus, would be likely to cause bitterness, especially when the number of St Paul's adherents began to increase, and a ruler of the synagogue was counted among them.