Acts 18:18

[After this]. After the affair before Gallio.

Paul tarried [there]. How long Paul remained, whether weeks or months, is not stated. The object is to show that this occurrence did not cause his departure.

Sailed thence into Syria. Antioch, the mother Gentile church from whence he started, was his destination.

Having shorn [his] head . . . for he had a vow. We know that the Jews were wont to make personal vows. For example, see Ge 28:20 Le 27:2 1Sa 1:11 2Sa 15:7. Paul complied with this custom of his race for some reason not explained. Why he took the vow, for how long, and what the shaving of the head had to do with it, are matters of conjecture. Nazarite vows required the shaving of the head in Jerusalem, and the hair cut off was offered in the temple (Nu 6:18). This could not have been a Nazarite vow. It is probable that he complied with some Jewish custom to aid him in reaching his own people with the gospel.

In Cenchrea. Cenchrea was the eastern harbor of Corinth, and received the commerce of Asia. A church was planted here (Ro 16:1).

Acts 18:26

Expounded unto him the way of God more perfectly. In my opinion Apollos' position was about that of the disciples of the Lord before the Great Commission was given. He had the gospel in part, but needed to be shown the way of the Lord "more perfectly". Aquila and Priscilla supplied this needed, and equipped him for gospel work.
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