Since Eden, the devil has been "prowling around like a roaring lion looking for [someone] to devour" (1 Peter 5:8). His presence is real, but it should not frighten. Satan's power is limited and can be rebuked by those who call upon God's intervention.
Father Gabriele Amorth, former chief exorcist of Rome, recommended in his book An Exorcist Tells His Story several prayers to combat any form of evil that may be oppressing an individual. He noted, however, that while these prayers are powerful, they are always to be joined with the sacrament of Confession and the frequent reception of Holy Communion.
It should also be stressed that the individual who prays these prayers should do so with humility, recognizing the fact that God is the one who expels evil from our midst. We do not have any power over Satan; only the Lord of Heaven and Earth possesses such authority.
1Anima Christi
Soul of Christ, sanctify me; Body of Christ, save me; Blood of Christ, inebriate me; Water from the side of Christ, wash me; Passion of Christ, strengthen me; O good Jesus, hear me; within Thy wounds, hide me; let me never be separated from Thee; from the evil one, deliver me; at the hour of my death, call me and bid me come to Thee, that with Thy saints, I may praise Thee forever and ever. Amen.
2Prayer Against Malefice from the Greek Ritual
Kyrie eleison. God, our Lord, King of ages, All-powerful and All-mighty, You Who made everything and Who transform everything simply by Your will. You Who in Babylon changed into dew the flames of the ‘seven-times hotter’ furnace and protected and saved the three holy children. You are the doctor and the physician of our soul. You are the salvation of those who turn to You. We beseech You to make powerless, banish, and drive out every diabolic power, presence, and machination; every evil influence, malefice, or evil eye and all evil actions aimed against Your servant [name of person/s]. Where there is envy and malice, give us an abundance of goodness, endurance, victory, and charity. O Lord, You Who love man, we beg You to reach out Your powerful hands and Your most high and mighty arms and send the angel of peace over us, to protect us, body and soul. May he keep at bay and vanquish every evil power, every poison or malice invoked against us by corrupt and envious people. Then, under the protection of Your authority may we sing, in gratitude, ‘The Lord is my salvation; whom should I fear? I will not fear evil because You are with me, my God, my strength, my powerful Lord, Lord of peace, Father of all ages.”
Yes, Lord our God, be merciful to us, Your image, and save your servant [name of person/s] from every threat or harm from the evil one, and protect him/her by raising him/her above all evil. We ask You this through the intercession of our Most Blessed, glorious Lady, Mary ever Virgin, Mother of God, of the most splendid archangels and all Your saints. Amen!
3Prayer for Deliverance
My Lord, you are all powerful, you are God, you are Father. We beg you through the intercession and help of the archangels Michael, Raphael and Gabriel, for the deliverance of our brothers and sisters who are enslaved by the evil one. All saints of Heaven, come to our aid.
From anxiety, sadness and obsessions, we beg You. Free us, O Lord. From hatred, fornication, envy, we beg You, Free us, O Lord. From thoughts of jealousy, rage, and death, we beg You, Free us, O Lord. From every thought of suicide and abortion, we beg You, Free us, O Lord. From every form of sinful sexuality, we beg You, Free us, O Lord. From every division in our family, and every harmful friendship, we beg You, Free us, O Lord. From every sort of spell, malefic, witchcraft, and every form of the occult, we beg You, Free us, O Lord.
Lord, You Who said, “I leave you peace, My peace I give you,” grant that, through the intercession of the Virgin Mary, we may be liberated from every evil spell and enjoy your peace always. In the name of Christ, our Lord. Amen.