Reference: Exorcist
Easton
(Ac 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 (Ac 8:9; 13:6)." Other references to exorcism as practised by the Jews are found in Mt 12:27; Mr 9:38; Lu 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.
The power of casting out devils was conferred by Christ on his apostles (Mt 10:8), and on the seventy (Lu 10:17-19), and was exercised by believers after his ascension (Mr 16:17; Ac 16:18); but this power was never spoken of as exorcism.
See Verses Found in Dictionary
Smith
Exorcist,
one who pretends to expel evil spirits by conjuration, prayers and ceremonies. Exorcism was frequently practiced among the Jews.
David, by playing skillfully on a harp, procured the temporary departure of the evil spirit which troubled Saul.
The power of casting out devils was bestowed by Christ while on earth upon the apostles,
and the seventy disciples
Lu 10:17-19
and was, according to his promise,
exercised by believers after his ascension.