Acts 17:4

And some of them, that is, of the Jews, in whose synagogue he preached, believed, and of those that¹ worshipped God, that is, of those who adored the only true God, though they had not submitted themselves to circumcision, and to the ceremonies of the Jewish law, and of the Gentiles, that is, of such as till that time had been heathens, and idolaters; so that here three sorts of persons were converted by St. Paul: 1. Jews; 2. worshippers of the true God that were not Jews; and 3. Gentiles. In this book of the Acts, mention is several times made of worshippers, to wit, of God, by which many understand Jewish proselytes: but as they neither were Jews already, nor perhaps ever designed to become Jews, we may distinguish two sorts of the Jewish proselytes. Some were proselytes to the Jewish religion, by a submission to circumcision, and to all the precepts and ceremonies of the Mosaic laws. These are also by some called proselytes of the covenant, being as much Jews as they who had been always so. Others are called proselytes of the gate, or proselytes to the God of the Jews, but not to the religion of the Jews. Of such seems to have been Cornelius, the centurion, (Acts x.) Lydia, (Acts xvi. 14.) and Titus Justus (Acts xviii. 7.) Such also seems to have been the eunuch of Candace, the queen of the Ethiopians, (Acts viii.) Naaman, the Syrian, after he was cured of his leprosy, (4 Kings v. 17.) and many others, that lived in Judea, and in other countries. These, therefore, are called worshippers, meaning of the true God, though they embraced not the legal precepts and ceremonies of the Jews. See Monsr. Heure's Dictionary. (Witham)

¹ De colentibus Gentilibusque. In the common Greek copies, there is no and, but only of the worshipping Gentiles, ton de sebomenon elleuon, but in other copies, kai ellenon.