Acts 21:21-24

21Now they have been told about you, that you are teaching all the Jews who are living among the Gentiles to turn away from [the Law of] Moses, advising them not to circumcise their children or to live according to the [Mosaic] customs.

22What then should be done? They will certainly hear that you have arrived.

23Therefore do just what we tell you. We have four men who have taken a vow;

24take these men and purify yourself along with them, and pay their expenses [for the temple offerings] so that they may shave their heads. Then everyone will know that there is nothing to the things they have been told about you, but that you yourself also follow and keep the Law.