Acts 21:26
Then Paul took the men, and the next day having purified himself with them, entered the temple, announcing the completion of the days of the purification, until the offering was made for every one of them.
Acts 24:18
in doing which they found me purified in the temple, not with a crowd nor with tumult; but certain Jews from Asia [caused it],
Acts 21:24
These take, and purify thyself with them, and pay the expenses for them, that they may shave their heads; and all will know that those things of which they have been informed concerning thee are nothing, but that thou thyself also walkest in observance of the Law.
1 Corinthians 9:20
and to the Jews I became as a Jew, that I might gain Jews; to those under the Law, as under the Law, not being myself under the Law, that I might gain those under the Law;