Acts 16:18

this did she many days Whether this following took place only on the sabbaths, when the Apostles were going to the place of prayer, in which case the Apostles must have remained in Philippi some weeks, or whether it was on every occasion on which they appeared in public, we are not told.

Paul, being grieved The Greek verb is somewhat stronger, and signifies "to be thoroughly worn out with annoyance." It is used (Acts 4:2), and nowhere else but here besides in N. T., of the annoyance of the priests and Sadducees at the teaching of the Apostles.

said to the spirit As Christ had acted when on earth, so Paul now will not allow the cry of the evil spirit, even though the words proclaim that he and his companions are servants of the Most High God. So in Christ's name he bids the evil power come forth.