Exodus 15:22-24

²²Then Moses led Israel from the Red Sea, and they went out into the wilderness of Shur; and they went three days in the wilderness and found no water. ²³When they came to Marah, they could not drink the waters of Marah, for they were bitter; therefore it was named Marah. ²⁴So the people grumbled at Moses, saying, “What shall we drink?”