Sforno on Deuteronomy 34:4/ספורנו על דברים ל״ד:ד׳

1הראיתיך בעיניך, in order for you to give it your blessing.

2שמה לא תעבור, so that by your crossing the river your blessing would not invalidate the decree issued by Me, that if the sins of the Jewish people were to reach a certain measure that they would be expelled from the land. [According to what the author explained on Deut.1,35-39 it was the fact that Moses was forbidden to cross the Jordan although personally not guilty of accepting the assessment of the 10 spies who counseled against trying to conquer the land, that preserved their chance to participate in the resurrection of the dead when the time would come for this. Our sages subscribe to the concept that whatever Moses did had enduring, eternal validity, provided it had been based on a valid premise. A blessing after setting foot in the Holy Land would have been of more enduring value than one pronounced when not on holy soil. Denying Moses the chance to pronounce his blessing while on holy soil, indirectly benefited the whole generation of the people who were adults at the time of the Exodus. It preserved their chance to participate in the resurrection, as did the fact that Moses was buried outside the Holy Land, and his appearance at the resurrection without the people whom he had shepherded for 40 years would be embarrassing for him. Ed.]