Deuteronomy 3:21,22

I commanded Joshua at that time.... Thine eyes have seen. — “Thine eyes are the witnesses of all,” &c. The conquest of Sihon and Og, as well as that of Amalek, was to be impressed upon Joshua (comp. Exodus 17:14) as a precedent for his encouragement, and also for his instruction. It is remarkable that no details are given us of the battles against Sihon and Og, or of the capture of the cities, except in Joshua 12:6, “Them did Moses the servant of the Lord smite.” We see the reflection of Moses’ campaign, which is unwritten, in the recorded campaigns of Joshua. The peculiar form of the sentence, “Thine eyes are they that see,” may also serve to remind us of the fact, that though the Law was given by Moses, no eye saw its full breadth and grasp until it came into the hand of Jesus, the antitype of Joshua.