Exodus 15:24-27

24So the people 1grumbled at Moses, saying, “What are we to drink?” 25Then he 2cried out to the Lord, and the Lord showed him 3a tree; and he threw it into the waters, and the waters became sweet.

There He 4made for them a statute and regulation, and there He 5tested them. 26And He said, “6If you will listen carefully to the voice of the Lord your God, and do what is right in His sight, and listen 7to His commandments, and keep all His statutes, 8I will put none of the diseases on you which I have put on the Egyptians; for I, 9the Lord, am your healer.”

27Then they came to 10Elim where there were twelve springs of water and seventy date palms, and they camped there beside the waters.