4. Yet there shall be a space, etc As the younger Levites, whose province it was to carry the ark, (Numbers 4:15) were strictly forbidden to touch it, or even to look at it, when uncovered, it is not wonderful that the common people were not allowed to approach within a considerable distance of it. The dignity of the ark, therefore, is declared, when the people are ordered to attest their veneration by leaving a long interval between themselves and it. And we know what happened to Uzzah, (2 Samuel 6) when seeing it shaken by restive oxen, he with inconsiderate zeal put forth his hand to support it. For although God invites us familiarly to himself, yet faithful trust so far from begetting security and boldness, is, on the contrary, always coupled with fear. In this way the ark of the covenant was, indeed, a strong and pleasant pledge of the divine favor, but, at the same time, had an awful majesty, well fitted to subdue carnal pride. This humility and modesty, moreover, had the effect of exercising their faith by preventing them from confining the grace of God within too narrow limits, and reminding them, that though they were far distant from the ark, the divine power was ever near.
In the end of the verse it is shown how necessary it was for them to be divinely guided by an unknown way; that anxiety and fear might keep them under the protection of the ark.