The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness (Kitab Al-Dhikr)
Muslim :: Book 35 : Hadith 6566
Abdullah reported that Allah's Messenger (may peace be upon him) used to supplicate (in these words):" O Allah. I beg of Thee the right guidance, safeguard against evils, chastity and freedom from want."