And what does "Im Yir'u es ha'Aretz" mean?
Rashi and Seforno: It means 'They will not see the land'. 1
Ramban: What Hashem meant was "Chai Ani, Veyimalei Ch'vod Hashem es Kol ha'Aretz - Because, If all these men who tested Me will see the land" - That will not happen!'. 2
To whom does "ve'Chol Mena'atzai Lo Yir'uhah" refer?
Ramban #1 (citing Ibn Ezra) and Seforno: It refers to the children of the current generation who are under twenty, and who will not see the land either in the event that they sin. 1
Ramban #2 and Targum Yonasan: It is a general statement which refers to anyone or any generation that angers Hashem.
Ramban #3 (citing Ta'anis, 29b): It refers to the generations that went into exile. 2
What are the implications of "Salachti ki'Devarechah" (in Pasuk 20), in light of this Pasuk "Im Yir'u es ha'Aretz"?
Ramban #2 (on Pasuk 17): It nevertheless implies forgiveness - because Hashem had withdrawn His original decree to kill the whole of Yisrael together with their children and to make Moshe into a great nation in their place. 3