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.

Then Moses severed three cities,.... To be cities of refuge, according to the command of God, Num 35:14 this he did when he had conquered the two kingdoms of the Amorites, that God had given them for an inheritance to the tribes of Reuben and Gad, and the half tribe of Manasseh, Deu 4:38 though Jarchi says, and so other Jewish writers, that persons were not received into them until the three cities appointed in the land of Canaan were separated for the like use; See Gill on Num 35:14 and these were:

on this side Jordan, toward the rising sun; on that side of the river on which the plains of Moab lay, and the kingdoms of the Amorites, and to the east of Jordan: so Jarchi remarks,"on that side which is on the east of Jordan;''see Jos 20:8.

Then Moses severed three cities on this side Jordan--(See on Jos 20:7).