Ben Yehoyoda
Parshas SheLachlecha
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This teaches us that (the Klal Yisroel upon hearing the Spies report) cast stones up to heaven. (Sotah 7)
This was to indicate the fact they forfeited the coming Temple (built of stones).
In addition-
The stones falling down indicates a heavy thing falling (coming to Israel is hard– 3 things come with suffering one of them is living in Israel).
This indicates the Spies spoke badly, and the people accepted there report, proving most of Klal Yisroel never had the Mesirus Nefesh to go to Israel.