In Lev. 17:7 the word "devil" is the translation of the Hebrew _sair_, meaning a "goat" or "satyr" (Isa. 13:21; 34:14), alluding to the wood-daemons, the objects of idolatrous worship among the heathen.
In the narratives of the Gospels regarding the "casting out of devils" a different Greek word (daimon) is used. In the time of our Lord there were frequent cases of demoniacal possession (Matt. 12:25-30; Mark 5:1-20; Luke 4:35; 10:18, etc.).