Exodus 17:6-7

Behold, I will stand before you there on the rock at Horeb; and you shall strike the rock, and water will come out of it, that the people may drink.” And Moses did so in the sight of the elders of Israel. He named the place Massah and Meribah because of the quarrel of the sons of Israel, and because they tested the LORD, saying, “Is the LORD among us, or not?”