Exodus 15:23-25

Wycliffe Bible

²³ And they came into Marah, and they might not drink the waters of Marah, for they were bitter; wherefore he putted a covenable name to the place, and called it Marah, that is, bitterness. (And they came to Marah, but they could not drink the water there, for it was bitter; so they put a suitable name to that place, and called it Marah, that is, Bitterness.)

²⁴ And the people grouched against Moses (And the people grumbled against Moses), and said, What shall we drink?

²⁵ And Moses cried to the Lord, which showed to him a tree; and when he had put that tree into the waters, those (waters) were turned into sweetness. There the Lord ordained commandments and dooms to the people, and there he assayed the people (There the Lord ordained commandments and judgements for the people, and he tested, or proved, the people there),