Acts 21:26
Then Paul took the men the next day, and after he had purified himself along with them, he went to the temple and gave notice of the completion of the days of purification, when the sacrifice would be offered for each of them.
Acts 24:18
which I was doing when they found me in the temple, ritually purified, without a crowd or a disturbance.
Numbers 6:13-20
"'Now this is the law of the Nazirite: When the days of his separation are fulfilled, he must be brought to the entrance of the tent of meeting,
Acts 21:24
take them and purify yourself along with them and pay their expenses, so that they may have their heads shaved. Then everyone will know there is nothing in what they have been told about you, but that you yourself live in conformity with the law.
1 Corinthians 9:20
To the Jews I became like a Jew to gain the Jews. To those under the law I became like one under the law (though I myself am not under the law) to gain those under the law.