Acts 19:13

Then some of the itinerant Jewish exorcists took it upon themselves to call the name of the Lord Jesus over those who had evil spirits, saying, " We exorcise you by the Jesus whom Paul preaches. "

1. There were still many Jewish men who were exorcists. See Matthew 7:21 (cast out demons in Your name) and Matthew 12:27 (By whom do your sons cast them out?)

2. While they were still Jews, not converted to Christianity, they called upon the Lord Jesus. They were invoking the power of Jesus to overcome the evil spirits.

3. They were also including the name of Paul.