Numbers 20:7-11

then the Lord spoke to Moses, saying, The Waters of Meribah

“Take the staff; and you and your brother Aaron assemble the congregation and speak to the rock before their eyes, that it shall yield its water. So you shall bring water for them out of the rock, and have the congregation and their livestock drink.”

So Moses took the staff from before the Lord, just as He had commanded him;

and Moses and Aaron summoned the assembly in front of the rock. And he said to them, “Listen now, you rebels; shall we bring water for you out of this rock?”

Then Moses raised his hand and struck the rock twice with his staff; and water came out abundantly, and the congregation and their livestock drank.