Exodus 15:25

And he cried to the Lord , and the Lord showed him a log , and he threw it into the water , and the water became sweet . There the Lord made for them a statute and a rule , and there he tested them,

Then Moses cried out to the Lord, and the Lord showed him a piece of wood. He threw it into the water, and the water became fit to drink. There the Lord issued a ruling and instruction for them and put them to the test.

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,