Exo17:6 See, I will take my place before you on the rock in Horeb; and when you give the rock a blow, water will come out of it, and the people will have drink. And Moses did so before the eyes of the chiefs of Israel.
Num20:11 And lifting up his hand, Moses gave the rock two blows with his rod: and water came streaming out, and the people and their cattle had drink enough.
Psm78:20 See, the rock was cut open by his power, so that the water came rushing out, and overflowing streams; is he able to give us bread? is he able to get meat for his people?