Matthew Poole and continuators on Acts 21:26

26 Then Paul took the men, and the next day purifying himself with them, entred into the temple, to signifie the accomplishment of the days of purification, until that an offering should be offered for every one of them.

Paul agrees to their advice, and follows it; and having set such a time for his Vow as might end with the other four mens, he, with the four mentioned,

signify to the Priest (that was concerned to know it, because of the Sacrifices that were to be offered for them) that the time of their separation was fulfilled, which is here called the days of Purification, for the reason intimated, verse 24.

Intending to abide in the Temple until all those Rites were performed which were required of them.

Marginal references: Chap. 24.18.; Numb. 6.13.