Kabbalah do Liczb 20:8

And because of the "erev rav" [mixed multitude] Israel was exiled, since it is written "And Adam was expelled". Adam is obviously Israel. And Moshe, because of them, was expelled from his place and did not merit to go up to the land of Israel. And because of them he transgressed the order of the Holy One of Blessing and hit the rock, that he struck it and did not speak to it, "you shall speak to the rock" - and they caused it. And with all this, the good thought of the Holy One of Blessing was combined into deed, that he (Moshe) did not receive them and give them the sign of circumcision were it not to cover the nakedness of his father. And the Holy One of Blessing said to him: "I will make from you a people, greater and more powerful than them" (Numbers 14:12). And because of them God said "whoever sinned against Me - I will erase from My book" (Exodus 22:23), since they are from the seed of Amalek, about whom it is written "erase the seed of Amalek" (Deuteronomy 25:19). And they too caused the breaking of the two tablets of Torah.

... upper rock / tsur dil`eyla