Read Acts 21:24 Using Other Translations
Them take, and purify thyself with them, and be at charges with them, that they may shave their heads: and all may know that those things, whereof they were informed concerning thee, are nothing; but that thou thyself also walkest orderly, and keepest the law.
take 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.
Go with them to the Temple and join them in the purification ceremony, paying for them to have their heads ritually shaved. Then everyone will know that the rumors are all false and that you yourself observe the Jewish laws.