Acts 21:25-26

25But as touching the Gentiles that have believed, we wrote, giving judgment that they should keep themselves from things sacrificed to idols, and from blood, and from what is strangled, and from fornication. 26Then 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.