Numbers 20:8-10

⁸Take the rod, and convene thou the assembly, thou, and Aaron thy brother, and speak ye to the rock before their eyes; and it shall give forth its water, and thou shalt bring forth to them water out of the rock: so thou shalt give drink to the congregation and their beasts.

⁹And Moses took the rod from before the LORD, as he commanded him.

¹⁰And Moses and Aaron assembled the congregation before the rock, and he said to them, Hear now, ye rebels; must we fetch you water out of this rock?