And God was doing extraordinary miracles by the hands of Paul,
11. No small miracles. He calleth miracles virtutes or powers, after the common custom of the Scripture, which were testimonies of the extraordinary power of God. And showeth that Paul’s apostleship was set forth with these ensigns, that his doctrine might have the greater authority. For it is a common speech, That wonders and signs are showed by the hand of men.
Paul is here very busy at Ephesus to do good. I. He begins, as usual, in the Jews' synagogue, and makes the first offer of the gospel to them, that he might gather in the lost sheep of the house of Israel, who were now scattered upon the mountains. Observe, 1. Where he preached to them: in their synagogue (Act 19:8), as Christ used to do.
Commenting on Acts 19:8-12
Then certain of the vagabond Jews,.... Who strolled about from place to place, pretending to tell fortunes, cure diseases by charms, and dispossess devils by conjuration, and therefore are called as follows, exorcists; such there were among the Jews, as Justin Martyr observes (h), who adjured by the God of Abraham, Isaac, and Jacob: these took upon them to call over them which had evil...