Deuteronomy 1:1

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. The place were they were now encamped was in the plain, in the land of Moab (Deu 1:1, Deu 1:5), where they were just ready to enter Canaan, and engage in a war with the Canaanites. Yet he discourses not to them concerning military affairs, the arts and stratagems of war, but concerning their duty to God; for, if they kept themselves in his fear and favour, he would secure to them the conquest of the land: their religion would be their best policy. 2. The time was near the end of the fortieth year since they came out of Egypt. So long God had borne their manners, and they had borne their own iniquity (Num 14:34), and now that a new and more pleasant scene was to be introduced, as a token for good, Moses repeats the law to them. Thus, after God's controversy with them on account of the golden calf, the first and surest sign of God's being reconciled to them was the renewing of the tables. There is no better evidence and earnest of God's favour than his putting his law in our hearts, Psa 147:19, Psa 147:20.

— Matthew Henry's Concise Commentary (public domain)