Acts 21:26
Then Paul took the men, and the next day purifying himself with them, entered into the temple, declaring the accomplishment of the days of purification, till the offering should be offered for every one of them.
Acts 24:18
Whereupon certain Jews from Asia found me purifying in the temple, neither with multitude, nor with tumult:
Acts 21:24
Take them and purify thyself with them, and be at charges with them, that they may shave their heads: and all will know, that there is nothing of those things which they have heard of thee; but that thou thyself walkest orderly, keeping the law.
1 Corinthians 9:20
To the Jews I became as a Jew, that I might gain the Jews: to them that are under the law, as under the law, that I might gain them that are under the law: