Acts 19:17

The name of the Lord Jesus was magnified - They saw that there was a sovereign power in the name of Jesus, which could not be imitated by these lying exorcists: they therefore reverenced this name, and despised those pretenders.

Exorcisms or adjurations of evil spirits were very frequent in the primitive Church: the name of Jesus was that alone which was used. The primitive fathers speak strong and decisive words concerning the power of this name; and how demons were tormented and expelled by it, not only from individuals, but from the temples themselves. Exorcists formed a distinct class an the Church; hence we read of presbyters, deacons, exorcists, lectors, and door-keepers. The adjuration was commonly used over the catechumens, before they were admitted to baptism. Gregory of Nazianzen, and Cyril of Jerusalem speak much of this rite. See my Succession of Sacred Literature, under Cyril, and Gregory Nazianzen; and see Suicer, under εξορκισμος .