Keeping the theme going, here are some more prayers to guide through times of temptation. 

* Psalm 95:8-9
(What better than some prayer from scripture)
Today if ye will hear his voice, harden not your hearts * as in the provocation,
and as in the day of temptation in the wilderness;
When your fathers tempted me, * proved me, and saw my works.

Matthew 6 (The Lord's Prayer) 
Lead me not into temptation but deliver me from evil. 

These are abundant, check out this list of scriptures for help in times of temptation

From the Book of Common Prayer
We prayer our prayers through Jesus Christ our Lord, who was in every way tempted as we are, yet did not sin; by whose grace we are able to triumph over every evil, and to live no longer unto ourselves, but unto him who died for us and rose again. Amen.

Soren Kierkegaard
O Lord Jesus Christ, who didst first love us, who until the end did love them whom Thou did love from the beginning, who unto the end of days dost continue to love him who would belong to Thee; Thy faithfulness cannot deny itself—oh, only when a man denies Thee can he compel Thee as it were to deny him also, Thou loving One. So be this our comfort when we must accuse ourselves of the offenses we have committed and of the things we have left undone, of our weakness in temptation, of our slow progress in the good, in short, of our unfaithfulness to Thee, to whom once in early youth and oftentimes again we promised faithfulness—this be our comfort, that even if we are unfaithful, Thou dost remain faithful, Thou can not deny Thyself. 

Almighty and most Merciful God, graciously hearken unto our prayers; and free our hearts from the temptations of evil thoughts; that we may worthily become a fit habitation for Thy Holy Spirit.

The Saint Augustine's Prayer Book
May the power of the holy cross +, O Lord, go before me wherever I may be and lead me through the day. In thy mercy, so guide me today that my enemy may find in me nothing that is his, but all that is thine. Or, should aught of evil be so found by reason of my frailty, may thy loving-kindness quickly blot it out. May thy holy angels guard me and bring me safe and unharmed unto the evening house. Amen.