The meaning of Exorcist in the Bible
(From Easton's Bible Dictionary)

(Acts 19:13). "In that sceptical and therefore superstitious age professional exorcist abounded. Many of these professional exorcists were disreputable Jews, like Simon in Samaria and Elymas in Cyprus (8:9; 13:6)." Other references to exorcism as practised by the Jews are found in Matthew 12:27; Mark 9:38; Luke 9:49,50. It would seem that it was an opinion among the Jews that miracles might be wrought by invoking the divine name. Thus also these "vagabond Jews" pretended that they could expel daemons.

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