Pope Leo XIII's Prayer to St. Michael
(Short Version)

Long version | Origin of the prayer

Sancte Michael Archangele, defende nos in praelio. Contra nequitiam et insidias diaboli esto praesidium.

Imperet illi Deus, supplices deprecamur. Tuque princeps militiae caelestis, Satanam aliosque spiritus malignos, qui ad perditionem animarum pervagantur in mundo divina virtute in infernum detrude.

Amen.

Saint Michael the Archangel, defend us in battle.  Be our protection against the malice 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, thrust into hell Satan and all evil spirits who wander through the world for the ruin of souls.

Amen.