The Man of GOD is particular in marking down the very spot, where he rehearsed and performed these things for Israel: because the place was truly memorable; for Israel now possessed, as it were, the earnest of the promised land. And there is somewhat striking also in the observation, that it was over against Beth-peor; that is, the idol temple of the GOD of the Moabites. And where so proper to show GOD'S people their mercies, as in the very face of the ungodly world? Oh! how ought the people of GOD to enumerate their mercies, and to mark down the several tokens of distinguishing grace, when they are in the very moment beholding that the LORD hath called them out from among the carnal, and manifested himself to them otherwise than he doth to the world. That is a precious Scripture of Paul's to this purpose, 1 Corinthians 4:7.
Deuteronomy 4:44-49
44 And this is the law which Moses set before the children of Israel:
45 These are the testimonies, and the statutes, and the judgments, which Moses spake unto the children of Israel, after they came forth out of Egypt,
46 On this side Jordan, in the valley over against Bethpeor, in the land of Sihon king of the Amorites, who dwelt at Heshbon, whom Moses and the children of Israel smote, after they were come forth out of Egypt:
47 And they possessed his land, and the land of Og king of Bashan, two kings of the Amorites, which were on this side Jordan toward the sunrising;
48 From Aroer, which is by the bank of the river Arnon, even unto mount Sion, which is Hermon,
49 And all the plain on this side Jordan eastward, even unto the sea of the plain, under the springs of Pisgah.