Moses cried out to the Lord, and the Lord showed him a piece of wood. He threw it into the water, and the water became sweet. There the Lord set down laws and rules for them to live by, and there he tested them.
About the tribe of Levi he said, “Your Thummim and Urim belong to your faithful people. You tested your people at Massah. You quarreled with them at the oasis of Meribah.
Remember that for 40 years the Lord your God led you on your journey in the desert. He did this in order to humble you and test you. He wanted to know whether or not you would wholeheartedly obey his commands.