Exodus 15:23-25

New International Version

²³ When they came to Marah, they could not drink its water because it was bitter. (That is why the place is called Marah.^[a](A)) ²⁴ So the people grumbled^(B) against Moses, saying, “What are we to drink?”^(C)

²⁵ Then Moses cried out^(D) to the Lord, and the Lord showed him a piece of wood. He threw^(E) it into the water, and the water became fit to drink.

There the Lord issued a ruling and instruction for them and put them to the test.^(F)