Abu Dawud Book 8, Hadith Number 2592.

Narated By AbuHurayrah : When the Apostle of Allah (PBUH) proceeded on journey, he would say: O Allah, Thou art the Companion in the journey, and the One Who looks after the family; O Allah, I seek refuge in Thee from the difficulty of travelling, finding harm when I return, and unhappiness in what I see coming to my family and property. O Allah, make the length of his journey short for us, and the journey easy for us.