Exodus 15:25
And he cried unto the Yahuah; and the Yahuah shewed him a tree, 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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Context
23 And when they came to Marah, they could not drink of the waters of Marah, for they 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 Yahuah; and the Yahuah shewed him a tree, 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,
26 And said, If you will diligently hearken to the voice of the Yahuah your Elohim, and will do that which is right in his sight, and will give ear to his commandments, and keep all his statutes, I will put none of these diseases upon you, which I have brought upon the Egyptians: for I the Yahuah that healeth you.
27 And they came to Elim, where twelve wells of water, and threescore and ten palm trees: and they encamped there by the waters.