* they kept.
  19  Ge 26:5  Jos 22:3  Eze 44:8  Zec 3:7 
   Some of the Levites may have been appointed to watch the
   moving of the pillar, and to give timely notice to the camp
   of its beginning to stir; and this is called "keeping the
   charge of the Lord." It is uncomfortable staying when God is
   departed, but very safe and pleasant going, when we see God
   go before us, and resting where he appoints us to rest.