Numbers 20:6-9

6And Moses and Aaron went from the presence of the assembly unto the door of the tent of meeting, and fell upon their faces: and the glory of Jehovah appeared unto them. 7And Jehovah spake unto Moses, saying, 8Take the rod, and assemble the congregation, thou, and Aaron thy brother, and speak ye unto the rock before their eyes, that it give forth its water; and thou shalt bring forth to them water out of the rock; so thou shalt give the congregation and their cattle drink. 9And Moses took the rod from before Jehovah, as he commanded him.