in acts 18:18 Paul had his hair cut off at cenchrea, Corinth's southeastern port because of a vow he had made

Question

what was his vow? when did he make it? some jews cut their hair after a misfortune and refused to make sacrifices for 30 days. is this why he did it?

whats the vow of the nazerite?

Answer 1

I agree - a Nazarite vow:

…. The most remarkable vow among the Jews was that of the Nazarite, by which a man made a solemn promise to God to abstain from wine, and from all intoxicating liquors, to let the hair grow, not to enter any house polluted by having a dead body in it, or to attend any funeral. This vow generally lasted eight days, sometimes a month, sometimes during a definite period fixed by themselves, and sometimes during their whole lives…. Those who made the vow out of Palestine, and who could not come to the temple when the vow was expired, contented themselves with observing the abstinence required by the Law, and cutting off the hair where they were. This I suppose to have been the case with Paul. His hair he cut off at the expiration of the vow at Cenchrea, though he delayed to perfect the vow by the proper ceremonies until he reached Jerusalem, Acts 21:23-24. (from Barnes' Notes, Electronic Database. Copyright (c) 1997 by Bibleso

Answer 2

The type of vow is not so much the issue as is the fact that he took a vow in order to secure the audience and confidence of fellow Jews in Jerusalem. For this action - whatever vow it was, violated the grace of God and contaminated Paul’s message of the gospel. For if the Jews had accepted Paul’s action they would have interpreted his message of the gospel to include human doing such as taking a vow. Lordship people do this all the time - insert human doing into what a man must do to have eternal life]

Go to the link below it will explain what the Nazirite Vow means

Answer 3

Vow of the Nazarite.