Beyond the Jordan, in the land of Moab, Moses undertook to explain this law, saying,
We have here, I. The date of this sermon which Moses preached to the people of Israel. A great auditory, no question, he had, as many as could crowd within hearing, and particularly all the elders and officers, the representatives of the people; and, probably, it was on the sabbath day that he delivered this to them. 1.
Commenting on Deuteronomy 1:1-8
On this side Jordan, in the land of Moab,.... On that side of Jordan in which the land of Moab was, and which with respect to the land of Canaan was beyond Jordan; this the Vulgate Latin version joins to the preceding verse: began Moses to declare this law: to explain it, make it clear and manifest; namely, the whole system and body of laws...
On this side Jordan, in the land of Moab, began Moses to declare this law--that is, explain this law. He follows the same method here that he elsewhere observes; namely, that of first enumerating the marvellous doings of God in behalf of His people, and reminding them what an unworthy requital they had made for all His kindness--then he rehearses the law and its various precepts.