Numbers 10:33

Three days journey, with continued journeys, only it seems most probable that the cloud made little pauses, that they might have time for sleep and necessary refreshments, which their natures required. And thus all writers, when they relate the continued journeys of persons for many days together, are to be understood with this exception. Before them; not so much in place, say some, for so it went in the midst, or at least after the first camp, as may seem from Numbers 10:21, as in office and authority, as a general who is said to go before or lead his army, though he do not go in the very first place. But others more probably think that the ark, which indeed is not mentioned Numbers 10:21, albeit in their stations it was in the middle, where also the cloud was, yet in their marches it went before them, as also the cloud did, and so the cloud was constantly over the ark, whether it stood or went; and therefore the ark is said to go before and direct them, not as if the ark could be seen of all the camps, which being carried only upon men's shoulders was impossible, but because the cloud, which always attended upon the ark, and did together with the ark constitute in a manner one sign of God's presence, did lead and direct them. To search out a resting-place, where they might safely and commodiously rest. But this is a metaphorical expression for discovering to them; for otherwise the ark could not. search, and God, who knew all places and things, heeded not to search.