What were Dasan and Aviram referring to when they said "Af Lo el Eretz Davas Chalav u'Devash Havi'osanu"?
Rashi: They were referring to Moshe's (broken) promise "A'aleh eschem me'Ani Mitzrayim el Eretz Tovah ... ", instead of which he decreed that they should all die in the desert. 1
And what did they mean when they said "ha'Einei ha'Anashim ha'heim Tenaker"?
Rashi and Targum Onkelos: They meant that even if Moshe sends to poke out their eyes should they refuse to go to him, they will not go.
Rashbam: 'Do you think that the people who are complaining are blind, that they cannot see how you took us out of Egypt, a good land, to die in the desert; how you did not keep your word ... !'
Seforno: 'Are you trying to blind our eyes, so that we should not see through your schemes?'
Targum Yonasan: 'Do you think that the Cana'anim are blind
To whom does "ha'Anashim ha'heim" refer?
Rashi, Rashbam, Seforno and Targum Onkelos: It refers to themselves (Dasan and Aviram). 1
Targum Yonasan: It refers to the inhabitanyts of Cana'an. 2
Why did they repeat "Lo Na'aleh"?
Rashbam: It is a sort of 'K'lal u'Perat u'K'lal'. First they made the statement "Lo Na'aleh", then they gave the reason and then they repeated adamantly "Lo Na'aleh!"
Targum Yonasan: The first time they meant that they would not appear before Moshe, the second time, that they would not go up to Eretz Yisrael.