19:1-8 Moses was called up the mountain, and was employed as the messenger of this covenant. The Maker and first Mover of the covenant, is God himself. This blessed charter was granted out of God's own free grace. The covenant here mentioned was the national covenant, by which the Israelites were a people under the government of Jehovah. It was a type of the new covenant made with true believers in Christ Jesus; but, like other types, it was only a shadow of good things to come. As a nation they broke this covenant; therefore the Lord declared that he would make a new covenant with Israel, writing his law, not upon tables of stone, but in their hearts, Jer 31:33; Heb 8:7-10. The covenant spoken of in these places as ready to vanish away, is the national covenant with Israel, which they forfeited by their sins. Unless we carefully attend to this, we shall fall into mistakes while reading the Old Testament. We must not suppose that the nation of the Jews were under the covenant of works, which knows nothing of repentance, faith in a Mediator, forgiveness of sins, or grace; nor yet that the whole nation of Israel bore the character, and possessed the privileges of true believers, as being actually sharers in the covenant of grace. They were all under a dispensation of mercy; they had outward privileges and advantages for salvation; but, like professing Christians, most rested therein, and went no further. Israel consented to the conditions. They answered as one man, All that the Lord hath spoken we will do. Oh that there had been such a heart in them! Moses, as a mediator, returned the words of the people to God. Thus Christ, the Mediator, as a Prophet, reveals God's will to us, his precepts and promises; and then, as a Priest, offers up to God our spiritual sacrifices, not only of prayer and praise, but of devout affections, and pious resolutions, the work of his own Spirit in us.

2. were come to the desert of Sinai—The desert has its provinces, or divisions, distinguished by a variety of names; and the "desert of Sinai" is that wild and desolate region which occupies the very center of the peninsula, comprising the lofty range to which the mount of God belongs. It is a wilderness of shaggy rocks of porphyry and red granite, and of valleys for the most part bare of verdure.

and there Israel camped before the mount—Sinai, so called from Seneh, or acacia bush. It is now called Jebel Musa. Their way into the interior of the gigantic cluster was by Wady Feiran, which would lead the bulk of the hosts with their flocks and herds into the high valleys of Jebel Musa, with their abundant springs, especially into the great thoroughfare of the desert—the longest, widest, and most continuous of all the valleys, the Wady-es-Sheikh, while many would be scattered among the adjacent valleys; so that thus secluded from the world in a wild and sublime amphitheatre of rocks, they "camped before the mount." "In this valley—a long flat valley—about a quarter of a mile in breadth, winding northwards, Israel would find ample room for their encampment. Of all the wadys in that region, it seems the most suitable for a prolonged sojourn. The 'goodly tents' of Israel could spread themselves without limit" [Bonar].