Exodus 17:5-6  The Lord answered Moses, “Go out in front of the people. Take with you some of the elders of Israel and take in your hand the staff with which you struck the Nile, and go.  I will stand there before you by the rock at Horeb. Strike the rock, and water will come out of it for the people to drink.” So Moses did this in the sight of the elders of Israel. 

Numbers 16:28-35 Then Moses said, “This is how you will know that the LORD has sent me to do all thesethings, for it was not my own doing: If these men die a natural death, or if they suffer the fate of all men, then the LORD has not sent me. But if the LORD brings about something unprecedented, and the earth opens itsmouth and swallows them and all that belongs to them so that they go down alive into Sheol, then you will know that these men have treated the LORD with contempt.”

As soon as Moses had finished saying all this, the ground beneath them split open, and the earth opened its mouth and swallowed them and their households—all Korah’s men and all their possessions. They wentdown alive into Sheol with all they owned. The earth closed over them, and they vanished from the assembly. 

At their cries, all the people of Israel who were around them fled, saying, “The earth may swallow us too!” And fire came forth from the LORD and consumed the 250 men who were offering the incense. 

Numbers 20:7-11 The Lord said to Moses,  “Take the staff, and you and your brother Aaron gather the assembly together. Speak to that rock before their eyes and it will pour out its water. You will bring water out of the rock for the community so they and their livestock can drink.”

So Moses took the staff from the Lord’s presence, just as he commanded him.  He and Aaron gathered the assembly together in front of the rock and Moses said to them, “Listen, you rebels, must we bring you water out of this rock?” Then Moses raised his arm and struck the rock twice with his staff. Water gushed out, and the community and their livestock drank.