About two thousand cubits - This distance they were to keep,
2. That the ark, which was to be their pilot over these waters, might be the more conspicuous which it could not have been had the people crowded upon it.
The ark, which was since the making of the covenant the special shrine and seat of God‘s presence, went before to show the people that God, through its medium, was their leader. They were to follow at a distance that they might the better observe and mark how the miracle was accomplished. This they would do to the greatest advantage while coming down the heights, the ark going on before them into the ravine.