Almighty God, Who delivered Your people from the bondage of the adversary, and through Your Son cast down Satan like lightning, deliver me also from every influence of unclean spirits. Command Satan to depart far from me by the power of Your only begotten Son. Rescue me from demonic imaginings and darkness. Fill me with the light of the Holy Spirit that I may be guarded against all snares of crafty demons. Grant that an angel will always go before me and lead me to the path of righteousness all the days of my life, to the honor of Your glorious Name, Father, Son and Holy Spirit, now and forever. Amen. 

Source: Fear Not