Numbers 10:31

How we are to encamp... — It is clear from these words, as well as from many indications of the same nature, that notwithstanding the direct guidance which was vouchsafed from heaven, and the miraculous interpositions of Providence which the Israelites experienced throughout their journeys, Moses did not neglect to take advantage of all the ordinary precautions of which it was incumbent upon him as the leader of his people to avail himself. The line of march and the places of encampment were clearly marked out by the cloud, but many difficulties would arise in the course of the journeys, and at the places of encampment, which Hobab’s familiarity with the desert would enable him to meet.