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.
Then the people murmured against Moses, saying, What shall we drink?
And he cried unto the LORD; and the ; and the LORD showed him a tree, which when he had cast it into the waters, the waters were made sweet. There he gave them statutes and rights, and there he proved them