Midrash su I Cronache 10:3

"Take the rod ... give the congregation and their cattle drink" -- From here [we learn] that the Holy One takes pity on Israel's money. "And Moses and Aaron gathered the assembly together before the rock" -- similarly it says "And all of the congregation he gathers to the door of the tent of meeting." This teaches that each one saw himself standing on the face of the rock. Likewise, when they crossed the Jordan, all of the Children of Israel entered between the staves of the ark, as it says (Joshua 3): "Joshua said to the Children of Israel, come near and listen to the words of Hashem." [Similarly] here all of Israel were standing and seeing all of the miracles of the rock. They began to say "Moses knows the rule of the rock. If he asks, it will bring forth water." So Moses was uncertain -- "If I listen to them I nullify the words of the Allpresent, and the Holy One (Job 5:13) 'takes the wise in theןr craftiness.'" But Moses had been careful for 40 years not to get angry at them, because he was terrified of the oath the Holy One swore: "Not one of these men will see [the land]..." They said to him: "Here is a rock; just as you want to bring forth water from another rock, bring it forth from this one." He shouted at them "Hear now, you rebels!" "Rebels (morim)" has many meanings: 1) "stubborn ones" 2) "fools" -- in the sea villages they call fools "morim". 3) "those who teach their teachers" 4) "archers" (In I Sam 31:3 the word "morim" is used to mean "archers".) ... Even so, Moses only used the rock that the Holy One told him [to use].