John Wesley on Acts 21:26

Then Paul took the men - Yielding his own judgment to their advice, which seemed to flow not out of spiritual but carnal wisdom; seeming to be what he really was not: making as if he believed the law still in force. Declaring - Giving notice to the priests in waiting, that he designed to accomplish the days of purification, till all the sacrifice should be offered, as the Mosaic law required, Num 6:13.