The neighborhood of the godless brings disaster, as Israel was to experience, for they lost the pious Aaron on the boundary of Edom, and buried him on Mount Hor. The cloud that used to precede Israel, had indeed been accustomed to level all the mountains, that they might move on upon level ways, but God retained three mountains in the desert: Sinai, as the place of the revelation; Nebo, as the burial-place of Moses; and Hor, consisting of a twin mountain, as a burial-place for Aaron. Apart from these three mountains, there were none in the desert, but the cloud would leave little elevations on the place where Israel pitched camp, that the sanctuary might thereupon be set up.