Exodus 17:6-7

6I will stand there before you by the rock at Horeb. Strike the rock, and water will come out of it for the people to drink.” So Moses did this in the sight of the elders of Israel.

7And he called the place Massah Massah means testing. and Meribah Meribah means quarreling. because the Israelites quarreled and because they tested the LORD saying, “Is the LORD among us or not?”