Exodus 15:23-27

23When they came to 1Marah, they could not drink the waters 2of Marah, because they were 3bitter; for that reason it was named 4Marah. 24So the people 5grumbled at Moses, saying, “What are we to drink?” 25Then he 6cried out to the Lord, and the Lord showed him 7a tree; and he threw it into the waters, and the waters became sweet.

There He 8made for them a statute and regulation, and there He 9tested them. 26And He said, “10If you will listen carefully to the voice of the Lord your God, and do what is right in His sight, and listen 11to His commandments, and keep all His statutes, 12I will put none of the diseases on you which I have put on the Egyptians; for I, 13the Lord, am your healer.”

27Then they came to 14Elim where there were twelve springs of water and seventy date palms, and they camped there beside the waters.