Exodus 17:6-7

and when you get to the rock at Mount Sinai, I will be there with you. Strike the rock with the stick, and water will pour out for the people to drink.” Moses did this while the leaders watched. The people had complained and tested the LORD by asking, “Is the LORD really with us?” So Moses named that place Massah, which means “testing” and Meribah, which means “complaining”.