Acts 21:24
So you join those men and go with them to God’s ceremony house, and do that ceremony with them, and pay for the things they buy. Then they can shave their heads. That’s our culture to show that they have done everything they promised to do. And the people will see you do all that with those men at the temple, and they will know that the things people told them about you are not true, and they will know that you do everything in our Jewish law and culture.