Acts 21:26
Then Paul took the men, and the next day purifying himself with them went into the temple, declaring the fulfilment of the days of purification, until the offering was offered for every one of them.
Acts 24:18
amidst which they found me purified in the temple, with no crowd, nor yet with tumult: but there were certain Jews from Asia--
Numbers 6:13-20
And this is the law of the Nazirite, when the days of his separation are fulfilled: he shall be brought unto the door of the tent of meeting:
Acts 21:24
these take, and purify thyself with them, and be at charges for them, that they may shave their heads: and all shall know that there is no truth in the things whereof they have been informed concerning thee; but that thou thyself also walkest orderly, keeping the law.
1 Corinthians 9:20
And to the Jews I became as a Jew, that I might gain Jews; to them that are under the law, as under the law, not being myself under the law, that I might gain them that are under the law;