Acts 21:21-24

21and they have been told about you that you teach all the Jews who are among the Gentiles to forsake Moses, telling them not to circumcise their children or walk according to our customs.

22What then is to be done? They will certainly hear that you have come.

23Do therefore what we tell you. We have four men who are under a vow;

24take these men and purify yourself along with them and pay their expenses, so that they may shave their heads. Thus all will know that there is nothing in what they have been told about you, but that you yourself also live in observance of the law.