Exodus 15:25-26

25Then he 1cried out to the Lord, and the Lord showed him 2a tree; and he threw it into the waters, and the waters became sweet.

There He 3made for them a statute and regulation, and there He 4tested them. 26And He said, “5If you will give earnest heed to the voice of the Lord your God, and do what is right in His sight, and give ear 6to His commandments, and keep all His statutes, 7I will put none of the diseases on you which I have put on the Egyptians; for I, 8the Lord, am your healer.”