It was the rocky mountain that was moved, and not the other, for this same rocky mountain was the beginning of the promised land, and at the approach of Israel from the other mountain, which was Moabite, the land leaped to meet them, for it awaited them most longingly.
An old proverb says: "If you give a piece of bread to a child, tell its mother about it." God, likewise, wanted Israel to know the great miracles He had accomplished for their sake, for they had no inkling of the attack the heathens had planned to make upon them. God therefore bade the well that had reappeared since their stay in Beeroth to flow past the caves and wash out parts of the corpses in great numbers. When Israel not turned to look upon the well, they perceived it in the valley of the Arnon, shining like the moon, and drawing corpses with it. Not until then did they discover the miracles that had been wrought for them. Not only did the mountains at first move together to let them pass, and then again move apart, but God saved them from great peril. They now intoned a song of praise to the well that revealed to them the great miracle.