Seven sons of Sceva were doing this. Sceva was a Jewish chief priest.
Some Jews went around driving out evil spirits. They tried to use the name of the Lord Jesus to set free those who were controlled by demons. They said, “In Jesus’ name I command you to come out. He is the Jesus that Paul is preaching about.”
One day the evil spirit answered them, “I know Jesus. And I know about Paul. But who are you?”