וְאֶת־יְהוֹשׁ֣וּעַ צִוֵּ֔יתִי בָּעֵ֥ת הַהִ֖וא לֵאמֹ֑ר עֵינֶ֣יךָ הָרֹאֹ֗ת אֵת֩ כָּל־אֲשֶׁ֨ר עָשָׂ֜ה יְהוָ֤ה אֱלֹהֵיכֶם֙ לִשְׁנֵי֙ הַמְּלָכִ֣ים הָאֵ֔לֶּה כֵּֽן־יַעֲשֶׂ֤ה יְהוָה֙ לְכָל־הַמַּמְלָכ֔וֹת אֲשֶׁ֥ר אַתָּ֖ה עֹבֵ֥ר שָֽׁמָּה׃
그 때에 내가 여호수아에게 명하여 이르기를 너희 하나님 여호와께서 이 두 왕에게 행하신 모든 일을 네가 목도하였거니와 네가 가는 모든 나라에도 여호와께서 이와 같이 행하시리니
Chizkuni
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.”
Or HaChaim
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.
Rabbeinu Bahya
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.