Exodus 17:2-7

17:2 So the people contended with Moses, and they said, “Give us water to drink!” Moses said to them, “Why do you contend with me? Why do you test the Lord?” 17:3 But the people were very thirsty there for water, and they murmured against Moses and said, “Why in the world did you bring us up out of Egypt – to kill us and our children and our cattle with thirst?”

17:4 Then Moses cried out to the Lord, “What will I do with this people? – a little more and they will stone me!” 17:5 The Lord said to Moses, “Go over before the people; take with you some of the elders of Israel and take in your hand your staff with which you struck the Nile and go. 17:6 I will be standing before you there on the rock in Horeb, and you will strike the rock, and water will come out of it so that the people may drink.” And Moses did so in plain view of the elders of Israel.

17:7 He called the name of the place Massah and Meribah, because of the contending of the Israelites and because of their testing the Lord, saying, “Is the Lord among us or not?”