Numbers 20:6-9

6And Moses and Aaron went from before the congregation to the entrance of the tent of meeting, and fell upon their faces; and the glory of Jehovah appeared to them.

7And Jehovah spoke to Moses, saying,

8Take the staff, and gather the assembly together, thou, and Aaron thy brother, and speak ye unto the rock before their eyes, and it shall give its water; and thou shalt bring forth to them water out of the rock, and shalt give the assembly and their beasts drink.

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