Deuteronomy 9:21
21. I cast the dust thereof into the brook that descended out of the mount—that is, "the smitten rock" (El Leja) which was probably contiguous to, or a part of, Sinai. It is too seldom borne in mind that though the Israelites were supplied with water from this rock when they were stationed at Rephidim (Wady Feiran), there is nothing in the Scripture narrative which should lead us to suppose that the rock was in the immediate neighborhood of that place (see on Ex 17:5). The water on this smitten rock was probably the brook that descended from the mount. The water may have flowed at the distance of many miles from the rock, as the winter torrents do now through the wadies of Arabia-Petræa (Ps 78:15, 16). And the rock may have been smitten at such a height, and at a spot bearing such a relation to the Sinaitic valleys, as to furnish in this way supplies of water to the Israelites during the journey from Horeb by the way of mount Seir and Kadesh-barnea (De 1:1, 2). On this supposition new light is, perhaps, cast on the figurative language of the apostle, when he speaks of "the rock following" the Israelites (1Co 10:4) [WILSON, Land of the Bible].
Hosea 10:8
8. Aven—that is, Beth-aven.
the sin—that is, the occasion of sin (De 9:21; 1Ki 12:30). they shall say to . . . mountains, Cover us—So terrible shall be the calamity, that men shall prefer death to life (Lu 23:30; Re 6:16; 9:6). Those very hills on which were their idolatrous altars (one source of their confidence, as their "king," Ho 10:7, was the other), so far from helping them, shall be called on by them to overwhelm them.