The name of the place was called Massah and Meribah, because of the quarreling of Bnei-Yisrael, and because they tested Adonai saying, “Is Adonai among us, or not?”
Then Moses said to Aaron, “Take the censer, put into it fire from the altar and put in incense. Get going and hurry to the assembly and make atonement for them, because wrath has come out from Adonai and the plague has started.”