Acts 19:13-15
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.” Also there were seven sons of Sceva, a Jewish chief priest, who did so.
And the evil spirit answered and said, “Jesus I know, and Paul I know; but who are you?”

I have always loved this scripture.
I think I first became aware of it as I attended college and took a course on the Book of Acts.
I have always wondered about these Jewish exorcist’s and by what authority they cast out demons before trying this method.
It’s evident they are not followers of Christ. The phrase “”the Jesus whom Paul preaches” really gives it away.
Regardless, their words had no power or authority in Jesus’ name.
The spirit was not subject to them, but knew Jesus and Paul.
After this revelation, the man with the evil spirit attacked the men and wounded them.
The true believer has nothing to fear from Satan, the devil, or evil spirits. WE are more than overcomers and victorious in Jesus mighty name.
I don’t go out looking for an encounter with an evil spirit but, in Jesus name, I won’t back down from one either.