Prayer to Saint Michael the Archangel:

“Saint Michael the Archangel, defend us in battle. Be our protection against the wickedness and snares of the devil. May God rebuke him, we humbly pray; and do Thou, O Prince of the Heavenly Host - - by the Power of God – cast into hell Satan and all the evil spirits who prowl about the world seeking the ruin of souls. AMEN.”
Pope Leo XIII (1878-1903)