1)
What is the corollary between "Ve'es ha'Aretz ha'Zos Yarashnu .... " and "me'Aro'er asher al Nachal Arnon"?
1.
Rashi: They refer to two different things: "Ve'es ha'Aretz ha'Zos Yarashnu .... " refers to "mi'Nachal Arnon ve'ad Har Chermon" (in connection with the inheritance described earlier), whereas "me'Aro'er asher al Nachal Arnon" refers to "Nasati la'Reuveni vela'Gadi" (that follows it).
