Acts 21:26
Then Paul associated himself with the men next day; he had himself purified along with them and went into the temple to give notice of the time when the days of purification would be completed ??the time, that is to say, when the sacrifice could be offered for each one of them.
Acts 24:18
and it was in presenting these that I was found within the temple. I was ceremonially pure, I was not mixed up in any mob or riot; no, the trouble was caused by some Jews from Asia,
Acts 21:24
associate yourself with them, purify yourself with them, pay their expenses so that they may be free to have their heads shaved, and then everybody will understand there is nothing in these stories about you, but that, on the contrary, you are guided by obedience to the Law.
1 Corinthians 9:20
To Jews I have become like a Jew, to win over Jews; to those under the Law I have become as one of themselves ??though I am not under the Law myself ??to win over those under the Law;