Sahih Muslim Book 35, Hadith Number 6562.
Chapter : Refuge from the evil of what one has done, and what one has not done.
Abu Huraira reported that when Allah’s Messenger (may peace be upon him) set out on a journey in the morning, he used to say: ” A listener listened to our praising Allah (for) His goodly trial of us. Our Lord! accompany us, guard us and bestow upon us Thy grace. I am seeker of refuge in Allah from the Fire.”