acts 20:16 For Paul had determined to sail by Ephesus, because he would not spend the time in Asia: for he hasted, if it were possible for him, to be at Jerusalem the day of Pentecost. - Free Bible Online

      16. For Paul had determined to sail by--or "sail past."
      Ephesus--He was right opposite to it when approaching Chios.
      because he would not spend time in Asia--the Asian province of which Ephesus was the chief city.
      for he hasted, if . . . possible . . . to be at Jerusalem the day of Pentecost--as a suitable season for giving in the great collection from all the western churches, for keeping the feast, and clearing his apostolic position with the Church, then represented in large number at Jerusalem. The words imply that there was considerable ground to doubt if he would attain this object--for more than three of the seven weeks from Passover to Pentecost had already expired--and they are inserted evidently to explain why he did not once more visit Ephesus.

JFB.