Acts 21:26
On this, Paul joined the men, and the next day shared their purification, and went into the Temple, and gave notice of the expiration of the period of purification when the usual offering should have been made on behalf of each of them.
Acts 24:18
And it was while engaged in this that they found me in the Temple, after completing a period of purification, but not with any crowd or disorder.
Acts 21:24
Join these men, share their purification, and bear their expenses, so that they may shave their heads; and then all will see that there is no truth in what they have been told about you, but that, on the contrary, you yourself rule your life in obedience to the Jewish Law.
1 Corinthians 9:20
To the Jews I became like a Jew, to win Jews. To those who are subject to Law I became like a man subject to Law-though I was not myself subject to Law-to win those who are subject to Law.