Prayer against every evil
May be used when one believes oneself under demonic harassment.
(Source: Exorcism: Encounters with the Paranormal and the Occult by Fr. Jocis Syquia)
Spirit of our God, Father, Son, and Holy Spirit, Most Holy Trinity, Immaculate Virgin Mary, angels, archangels, and saints of heaven, descend upon me. Please purify me, Lord, mold me, fill me with Yourself, use me. Banish all the forces of evil from me, destroy them, vanquish them, so that I can be healthy and do good deeds. Banish from me all spells, witchcraft, black magic, malefice, ties, maledictions, and the evil eye; diabolic infestations, oppressions, possessions; all that is evil and sinful, jealousy, perfidy, envy; physical, psychological, moral, spiritual, diabolical ailments. Burn all these evils in hell, that they may never again touch me or any other creature in the entire world.
I command and bid all the powers who molest me, by the power of God all powerful, in the Name of Jesus Christ our Savior, through the intercession of the Immaculate Virgin Mary, to leave me forever, and to be consigned into the everlasting hell, where they will be bound by Saint Michael the Archangel, Saint Gabriel, Saint Raphael, our guardian angels, and where they will be crushed under the heel of the Immaculate Virgin Mary.