Sahih Muslim Book 35, Hadith Number 6561.
Chapter : Refuge from the evil of what one has done, and what one has not done.
Ibn ‘Abbas reported that Allah’s Messenger (may peace be upon him) used to say: “O Allah, it is unto Thee that I surrender myself. I affirm my faith in Thee and repose my trust in Thee and turn to Thee in repentance and with Thy help fought my adversaries. O Allah, I seek refuge in Thee with Thine Power; there is no god but Thou, lest Thou leadest me astray. Thou art ever-living that dieth not, while the Jinn and mankind die.”