Moses called the place Massah and Meribah. That’s because the people of Israel argued with him there. They also tested the Lord. They asked, “Is the Lord among us or not?”
Moses said to Aaron, “Take your incense cup. Put incense in it. And put burning coals from the altar in it. Then hurry to the people and pay for their sin. The Lord has begun to show his anger. The plague has started.”
Here’s what Moses said about Levi. “Your Thummim and Urim belong to your faithful servant. You tested him at Massah. You argued with him at the waters of Meribah.