Exodus 15:21-23

New Revised Standard Version, Anglicised Catholic Edition

²¹ And Miriam sang to them:

Bitter Water Made Sweet

²² Then Moses ordered Israel to set out from the Red Sea,^[a] and they went into the wilderness of Shur. They went for three days in the wilderness and found no water. ²³ When they came to Marah, they could not drink the water of Marah because it was bitter. That is why it was called Marah.^[b]