There is a intersting pshat in the sefer Peninim Yekorim. Moshe Rabbenu was the shaliach as Avraham Avunu provided water to the malochim through a shaliach, so the Jews were also given water through a shaliach. Hoewer, shechina medabers mitoch gerono, the shechina spoke through his voice, so he was unable to speak and had to hit the rock. When he became angry at them. the shechina left and now he could have spoken himself.
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