And they came to Marah, and they were not able to drink water from Marah because it was bitter. Therefore it was named Marah. And the people grumbled against Moses, saying, “What shall we drink?” And he cried out to Yahweh, and Yahweh showed him a piece of wood, and he threw it into the water, and the water became sweet. There he made a rule and regulation for them, and there he tested them.