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,
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Interpretation
In the wilderness of Shur the Israelites had no water. At Marah they had water, but it was bitter; so that they could not drink it.
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This thought runs through Exodus 15:23-26.