Exodus 15:21-23

Darby Translation

²¹ And Miriam answered them, Sing to Jehovah, for he is highly exalted: The horse and his rider hath he thrown into the sea.

²² And Moses brought 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.

²³ And they came to Marah, and could not drink the waters of Marah, for they were bitter; therefore the name of it was called Marah.