Exodus 15:21-23 21st Century King James Version (KJ21)
21 And Miriam answered them: “Sing ye to the Lord, for He hath triumphed gloriously; the horse and his rider hath He thrown into the sea!”
22 So 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 when they came to Marah, they could not drink of the waters of Marah, for they were bitter. Therefore the name of it was called Marah [that is, Bitterness].