Exodus 15:25-27

Living Bible

²⁵ Moses pleaded with the Lord to help them, and the Lord showed him a tree to throw into the water, and the water became sweet.

It was there at Marah that the Lord laid before them the following conditions, to test their commitment to him: ²⁶ “If you will listen to the voice of the Lord your God, and obey it, and do what is right, then I will not make you suffer the diseases I sent on the Egyptians, for I am the Lord who heals you.” ²⁷ And they came to Elim where there were twelve springs and seventy palm trees; and they camped there beside the springs.