Exodus 15:24

²²So Moses brought up the children of Israel from the Red Sea, and brought them into the wilderness of Shur; and they went three days in the wilderness, and found no water to drink.

²³And they came to Marah, and could not drink of Marah, for it was bitter; therefore he named the name of that place, Bitterness.

— Exodus 15:24 —

²⁵And Moses cried to the Lord, and the Lord showed him a tree, and he cast it into the water, and the water was sweetened: there he established to him ordinances and judgments, and there he proved him,

²⁶and said, If thou wilt indeed hear the voice of the Lord thy God, and do things pleasing before him, and wilt hearken to his commands, and keep all his ordinances, no disease which I have brought upon the Egyptians will I bring upon thee, for I am the Lord thy God that heals thee.