Acts 21:24

‘The Nazirite shall then shave the head of hair for his Nazirite vow at the doorway of the tent of meeting and take the hair of his head of his Nazirite vow and put it on the fire which is under the sacrifice of peace offerings.

And Paul, having remained many days longer, took leave of the brothers and put out to sea for Syria, and with him were Priscilla and Aquila. In Cenchreae he had his hair cut, for he was keeping a vow.

Then Paul took the men, and the next day, purifying himself along with them, went into the temple giving notice of the completion of the days of purification, until the sacrifice was offered for each one of them.

And to the Jews I became as a Jew, so that I might win Jews. To those who are under the Law, as under the Law though not being myself under the Law, so that I might win those who are under the Law.