Acts 21:25-26

25As concerning the Gentiles who believe, we have written and concluded that they observe no such thing, except that they keep themselves from things offered to idols, and from blood, and from strangled, and from immorality. 26Then Paul took the men, and the next day purifying himself with them entered into the temple, to signify the accomplishment of the days of purification, until an offering should be offered for every one of them.