Abu Dawud Book 36, Hadith Number 5043.
Chapter : Not known.
Narated By ‘Aisha, Ummul Mu’minin : When the Apostle of Allah (PBUH) awake at night, he said: There is no god but thou, glory be to Thee, O Allah, I ask Thy pardon for my sin and I ask Thee for Thy mercy. O Allah! advance me in knowledge: do not cause my heart to deviate (from guidance) after Thou hast guided me, and grant me mercy from thyself; verily thou art the grantor.