Numbers 20:7-11

And God spoke to Moses, saying, "You and your brother Aaron take the rod and assemble the community, and before their very eyes order the rock to yield its water. Thus you shall produce water for them from the rock and provide drink for the congregation and their beasts." Moses took the rod from before God, as God had commanded him. Moses and Aaron assembled the congregation in front of the rock; and he said to them, "Listen, you rebels, shall we get water for you out of this rock?" And Moses raised his hand and struck the rock twice with his rod. Out came copious water, and the community and their beasts drank. [JPS translation]