5And the LORD said to Moses, “Walk on ahead of the people and take some of the elders of Israel with you. Take along in your hand the staff with which you struck the Nile, and go.
6Behold, I will stand there before you by the rock at Horeb. And when you strike the rock, water will come out of it for the people to drink.” So Moses did this in the sight of the elders of Israel.
— Exodus 17:5-6