Rashi on Deuteronomy 32:51/רש"י על דברים ל״ב:נ״א

1על אשר מעלתם בי BECAUSE YE TRESPASSED AGAINST ME — i.e., because you made the people to trespass against Me.

2על אשר לא קדשתם אותי BECAUSE YE SANCTIFIED ME NOT — i.e. because you brought it about that I was not sanctified; I said to you, ‘Speak to the rock!” They, however, smote it and had therefore to smite it twice. Had they, however, spoken to it, and it had given forth its water without being smitten, the Name of the Heaven would have been sanctified; for the Israelites would have said, “How is it with the rock which is subject neither to reward nor to punishment, for when it acts meritoriously it receives no reward and when it sins it is not punished? It fulfils so obediently the command of its Creator! — how much the more should we do so!”