"Then Moses caused Israel to set out from the Sea of Reeds. They went on into the wilderness of Shur; they traveled three days in the wilderness and found no water. They came to Marah, but they could not drink the water of Marah because it was bitter; that is why it was named Marah. And the people grumbled against Moses, saying, 'What shall we drink?' So he 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."