Sifrei Devarim 340

¹(Devarim 32:51) ("And die") "because of your having trespassed against Me": i.e., you led to a trespass against Me." "because of your not having sanctified Me": i.e., you led to a transgression of My word: ²The Holy One Blessed be He said to him: Moses, did I not tell you (Shemoth 4:17) "And you shall take this rod in your hand, wherewith you shall do the signs"? And you did so, and did not hold back, viz. ( Ibid . 30) "And he did the signs in the sight of the people" — then speaking (to the rock), which is (relatively) a light matter, you should not have held back. And he did not depart from there until He "bound him in His wings" (i.e., until he died), viz. (Bamidbar 20:12) "Therefore, you shall not bring this congregation into the land, etc."