A Prayer of the Holy Prophet (sa) for Tahajjud Prayer
“There is none worthy of worship except You. Holy are You O Allah, I seek Your forgiveness for my sins and beg for Your Mercy. O Allah, increase my knowledge and do not let my heart become perverse after You have guided it. You Yourself bestow Mercy upon me. Surely You are the Greatest Giver.”
(Abu Dawud, Kitabul-Adab, Babo ma yaqulur- Rajulo idha Ta‘arra minal-Lail)