Exodus 15
23 Ref and they come in to Marah, and have not been able to drink the waters of Marah, for they `are' bitter; therefore hath `one' called its name Marah.
24 Ref And the people murmur against Moses, saying, `What do we drink?'
25 Ref and he crieth unto Jehovah, and Jehovah sheweth him a tree, and he casteth unto the waters, and the waters become sweet. There He hath made for them a statute, and an ordinance, and there He hath tried them,