Luke: Evidently there were false exorcists as there were false prophets. The false exorcists might actually drive out a demon but without the power to prevent re-possession. That would be similar to Moses’ experience with the magicians in Egypt: who could replicate what Moses did but with weaker results. Consider the seven sons of the chief priest Sceva in Acts 19.
Gospel: Luke 11:14-26
New Testament: Revelation 11:1-14
Old Testament: Genesis 5:25-32