Exodus 15:21-23 Tree of Life Version (TLV)
21 as Miriam sang to them:
Sing to Adonai, for He is highly exalted!
Bitter Waters Made Sweet
22 Then Moses led Israel onward from the Sea of Reeds. They went out into the wilderness of Shur. But they travelled three days in the wilderness and found no water. 23 When they came to Marah, they could not drink from the waters because they were bitter. On account of this it was called Marah.