What do we pray for in the fifth petition?
That God would pardon our sins for Christ's sake, and enable us to forgive those who have injured us.
1 John 1:9 If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrigheousness.
Matthew 6:14 For if you forgive men for their transgressions, your heavenly Father will also forgive you.