פּירוש אויף דברים 3:21

ואת יהושע צותי, “and I have commanded Joshua;” this is what has been written in Numbers 27,23: ויסמוך ידיו עליו ויצוהו, “he (Moses) placed his hands firmly upon him, and he commanded him.”

ואת יהושוע צויתי, "And I commanded Joshua, etc." Moses meant that he commanded Joshua not to be afraid of these nations, as we find at the end of verse 22: לא תיראום "you must not be afraid of them." Moses did not repeat the words "your eyes are seeing" at the end of verse 22, as this is not something which forms the subject of a command.

עיניך הרואות את כל אשר עשה ה' אלו-היכם לשני המלכים האלה, כן יעשה ה' לכל הממלכות, “your eyes who have witnessed all that the Lord your G’d has done to these two kings, thus will the Lord do to all the kingdoms.” Moses reinforced the people’s confidence regarding the battles ahead by recalling to them what they had themselves experienced in the war against Sichon and Og. This would give them the necessary faith in G’d that they would easily overcome the 31 kings who would be defeated before the Israelites under the leadership of Joshua. Also Joshua’s heart was strengthened by these reminders of Moses that it would be he who would enter the land that Moses himself had not been allowed to enter.