Numbers 20:6-9

6Then Moses and Aaron went from the presence of the assembly to the entrance of the tent of meeting and fell on their faces. And the glory of the Lord appeared to them,

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.