Exodus 17:4-6

4Then Moses called to the Lord for help. He said, ‘What can I do with these people? They will soon be throwing stones at me to kill me.’

5The Lord said to Moses, ‘Take some of the leaders of the Israelites with you and go in front of the people. Take your stick in your hand. Take the stick that you used to hit the Nile river. Now go!

6I will stand there, in front of you, by the rock at Sinai. Hit the rock with your stick, and water will come out of it. Then the people can drink.’ So Moses did this, while the leaders of the Israelites watched him.