Deuteronomy 3:21

At that time , i . e . after the conquest of the land on the east of the Jordan (see Numbers 27:12 , etc.). Thine eyes have seen , etc. Joshua was directed to what he had himself witnessed, what his own eyes had seen, in the destruction of Sihon and Og and their hosts, that he might be encouraged to go forward in the course to which he had been called; and the people are reminded of this, that they may keep in mind what God had done for Israel, and may without fear follow Joshua as their leader to the conquest of Canaan (comp. Deuteronomy 31:23 ).