Abu Dawud Book 36, Hadith Number 5036.
Chapter : Not known.
Narated By AbulAzhar al-Anmari : When the Apostle of Allah (PBUH) went to his bed at night, he would say: in the name of Allah, I have laid down my side for Allah. O Allah! forgive me my sin, drive away my devil, free me from my responsibility, and place me in the highest assembly.