Acts of the Apostles 19:13-15

A group of Jews was traveling from town to town casting out evil spirits. They tried to use the name of the Lord Jesus in their incantation, saying, “I command you in the name of Jesus, whom Paul preaches, to come out!” Seven sons of Sceva, a leading priest, were doing this. But one time when they tried it, the evil spirit replied, “I know Jesus, and I know Paul, but who are you?”