Note 1 at Acts 18:18: Cenchrea was one of the two seaports of the city of Corinth (see note 1 at Acts 18:1, p. ???). It was the eastern port located about nine miles from the city on the Aegean Sea. Paul embarked for Syria (see note 1 at Acts 15:23, p. 661) from this port. There was a church located in Cenchrea which Paul mentioned years later in his letter to the Romans in association with Phebe (Rom. 16:1).

Note 2 at Acts 18:18: It is not clear what this vow was or even who took it. Some people have argued that it was Aquila that took the vow instead of Paul. If a person who had made a Nazarite vow became defiled, he had to shave his head and start over (Num. 6:1-21) but it isn't certain that this is the vow that is referred to.