Exodus 15:23-25

23When they came to aMarah, they could not drink the water of Marah because it was bitter; therefore it was named Marah.
 Marah means bitterness
24And the people cgrumbled against Moses, saying, “What shall we drink?” 25And he dcried to the Lord, and the Lord showed him a log,
Or tree
and he fthrew it into the water, and the water became sweet.

There the Lord
Hebrew he
made for them a statute and a rule, and there he htested them,
Copyright information for ESV