Acts 21:26
Then Paul took the [four] men, and the next day he purified himself along with them [by submitting to the ritual]. He went into the temple to give notice of [the time] when the days of purification [ending each vow] would be fulfilled and the usual offering could be presented on behalf of each one.
Acts 24:18
They found me in the temple presenting these offerings, after I had undergone [the rites of] purification, without any crowd or uproar. But there were some Jews from [the west coast province of] Asia [Minor],
Numbers 6:13-20
‘Now this is the law of the Nazirite when the days of his separation and dedication are fulfilled: he shall bring the offering to the doorway of the Tent of Meeting (tabernacle).
Acts 21:24
take 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.
1 Corinthians 9:20
To the Jews I became as a Jew, so that I might win Jews [for Christ]; to men under the Law, [I became] as one