Holy Guardian Angels

Almighty God, who hast delivered thy people from the bondage of the adversary, and through thy Son hast cast down Satan like lightning: deliver us also from every influence of unclean spirits. Command Satan to depart far from us by the power of thine only begotten Son. Rescue us from demonic imaginings and darkness. Fill us with the light of the Holy Spirit, that we may be guarded against all snares of crafty demons. Grant that thine angels will always go before us and lead us to the path of righteousness all the days of our lives; to the honour of thy glorious Name, Father, Son, and Holy Spirit, now and forever. Amen.

Or this:

O God, who of thy ineffable providence dost vouchsafe to send thy holy angels to be our guardians: grant to us thy humble servants, that we may in this life ever be defended by their protection, and rejoice in their everlasting company in heaven; through Jesus Christ our Lord. Amen.