Read this passage and open each verse for the full verse feed and commentary tools.
26Then Paul took the men, and the next day he purified himself with them and went into the temple, to give notice when the days of purification would be fulfilled and the offering presented for every one of them.
27When the seven days were almost completed, the Jews from Asia, who had seen him in the temple, stirred up all the crowd, and laid hands on him,
Acts 21:26-27 (RSV)