Why were Yisrael in Egypt and Ashur?
Radak: They went there 1 due to the afflictions [in Eretz Yisrael].
We fixed Radak's text to say l'Sham. Our text mi'Sham is difficult - even without afflictions, they would leave to return to Eretz Yisrael! (PF)
Where is "Gil'ad"?
Radak: It is Ever (the east side of) ha'Yarden.
What is "Levanon"?
Rashi, Targum Yonasan: It is the Beis ha'Mikdash.
Radak: It is all of Eretz Yisrael on this [west] side [of the Yarden] - "ha'Har ha'Tov ha'Zeh veha'Levanon" (Devarim 3:25). Malbim - they will return to their inheritances on both sides of the Yarden.
What is the meaning of "v'Lo Yimatzei Lahem"?
Rashi citing Targum Yonasan: It will not suffice for them (Radak - because they are so numerous). Malbim - the border of the land will expand in every direction.