Exodus 15:23-25

King James Version

²³ And when they came to Marah, they could not drink of the waters of Marah, for they were bitter: therefore the name of it was called Marah.

²⁴ And the people murmured against Moses, saying, What shall we drink?

²⁵ And he cried unto the Lord; and the Lord shewed him a tree, which when he had cast into the waters, the waters were made sweet: there he made for them a statute and an ordinance, and there he proved them,