Bible Verses About Purification: Of Paul, to show his fidelity to the law

Take them, and purify yourself with them, and pay their expenses for them, that they may shave their heads. Then all will know that there is no truth in the things that they have been informed about you, but that you yourself also walk keeping the Torah.

Then Paul took the men, and the next day, purified himself and went with them into the temple, declaring the fulfillment of the days of purification, until the offering was offered for every one of them.