Here is, 1. The nomination of the cities of refuge on that side Jordan where Israel now lay encamped. Three cities were appointed for that purpose, one in the lot of Reuben, another in that of Gad, and another in that of the half tribe of Manasseh, Deu 4:41-43. What Moses could do for that people while he was yet with them he did, to give example to the rulers who were settled that they might observe them the better when he was gone. 2. The introduction to another sermon that Moses preached to Israel, which we have in the following chapters. Probably it was preached the next sabbath day after, when the congregation attended to receive instruction. He had in general exhorted them to obedience in the former chapter; here he comes to repeat the law which they were to observe, for he demands a universal but not an implicit obedience. How can we do our duty if we do not know it? Here therefore he sets the law before them as the rule they were to work by, the way they were to walk in, sets it before them as the glass in which they were to see their natural face, that, looking into this perfect law of liberty, they might continue therein. These are the testimonies, the statutes, and the judgments, the moral, ceremonial, and judicial laws, which had been enacted before, when Israel had newly come out of Egypt, and were now repeated, on this side Jordan, Deu 4:44-46. The place where Moses gave them these laws in charge is here particularly described. (1.) It was over-against Beth-peor, an idol-temple of the Moabites, which perhaps Moses sometimes looked towards, with a particular caution to them against the infection of that and other such like dangerous places. (2.) It was upon their new conquests, in the very land which they had got out of the hands of Sihon and Og, and were now actually in possession of, Deu 4:47. Their present triumphs herein were a powerful argument for obedience.

From Aroer, which is by the bank of the river Arnon,.... A city of Moab, which was situated on the bank of the river Arnon, that was on the border of Moab, Deu 2:36,

even unto Mount Sion, which is Hermon; the meaning is, that the lands of these two kings conquered by Israel reached from the city Aroer on the river Arnon to Mount Hermon, the one being the southern, the other the northern boundary of them. Here Hermon has another name Sion, and is to be carefully distinguished from Mount Zion near Jerusalem; it lying in a different country, and being written with a different letter in the Hebrew language. In the Septuagint version it is called Seon, and by the Targums of Jonathan and Jerusalem the mount of snow; See Gill on Deu 3:9.

Beth-peor--that is, "house" or "temple of Peor." It is probable that a temple of this Moabite idol stood in full view of the Hebrew camp, while Moses was urging the exclusive claims of God to their worship, and this allusion would be very significant if it were the temple where so many of the Israelites had grievously offended.