Numbers 20:7-11

7and the Lord spoke to Moses, saying,

8"Take the staff, and assemble the congregation, you and Aaron your brother, and tell the rock before their eyes to yield its water. So you shall bring water out of the rock for them and give drink to the congregation and their cattle."

9And Moses took the staff from before the Lord, as he commanded him.

10Then Moses and Aaron gathered the assembly together before the rock, and he said to them, "Hear now, you rebels: shall we bring water for you out of this rock?"

11And Moses lifted up his hand and struck the rock with his staff twice, and water came out abundantly, and the congregation drank, and their livestock.