Mishkat al-Masabih #2332

Abu Huraira told of a man who said, “Messenger of God, I intend to make a journey, so give me an injunction.” He told him to maintain fear of God and say “God is most great” on every rising ground, and when the man turned away he said, “O God, make the distance short for him and make the journey easy for him.” Tirmidhi transmitted it.