From the Book of Common Prayer:
O God, who art the author of peace and lover of concord, in knowledge of whom standeth our eternal life, whose service is perfect freedom: Defend us thy humble servants in all assaults of our enemies; that we, surely trusting in thy defence, may not fear the power of any adversaries; through the might of Jesus Christ our Lord. Amen.
O Lord, our heavenly Father, Almighty and everlasting God, who hast safely brought us to the beginning of this day: Defend us in the same with thy mighty power; and grant that this day we fall into no sin, neither run into any kind of danger; but that all our doings may be ordered by thy governance, to do always that is righteous in thy sight; through Jesus Christ our Lord. Amen.