Charles Buck Theological Dictionary
The expelling of devils from persons possessed, by means of conjuration and prayers. The Jews made great pretences to this power. Josephus tells several wonderful tales of the great success of several exorcists. One Eleazer, a Jew, cured many daemoniacs, he says, by means of a root set in a ring. This root, with the ring, was held under the patient's nose, and the devil was forthwith evacuated. The most part of conjurers of this class were impostors, each pretending to a secret nostrum or charm which was an overmatch for the devil. Our Saviour communicated to his disciples a real power over daemons, or at least over the diseases said to be occasioned by daemons.
See DAEMONIAC. Exorcism makes a considerable part of the superstition of the church of Rome, the ritual of which forbids the exorcising any person without the bishop's leave. The ceremony is performed at the lower end of the church, towards the door. The exorcist first signs the possessed person with the sign of the cross, makes him kneel, and sprinkles him with holy water. Then follow the litanies, psalms, and prayer; after which the exorcist asks the devil his name, and adjures him by the mysteries of the Christian religion not to afflict the person any more; then, laying his right hand on the daemoniac's head, he repeats the form of exorcism, which is this: "I exorcise thee, unclean spirit, in the name of Jesus Christ: tremble, O Satan, thou enemy of the faith, thou foe of mankind, who hast brought death into the world; who hast deprived men of life, and hast rebelled against justice, thou seducer of mankind, thou root of all evil, thou source of avarice, discord, and envy." The Romanists likewise exorcise houses and other places supposed to be haunted by unclean spirits; and the ceremony is much the same with that for a person possessed.
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Buck, Charles. Entry for 'Exorcism'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/e/exorcism.html. 1802.