Exodus 17:6-7

6Behold, I will stand before you there on the rock at Horeb; there you shall strike the rock, and water will come out of it, so that the people may [have something to] drink.” And Moses did so in the sight of the elders of Israel.

7He named the place [where this miracle occurred] Massah (test) and Meribah (contention) because of the quarreling of the sons of Israel, and because they tested the [patience of the] Lord, saying, “Is the Lord among us, or not?”