Exodus 15:22-27 - Yahweh Provides Water At Marah
22 Moses brought Israel from the reed sea, and they went out into the wilderness of Shur. And they went three days long in the wilderness, and could find no water. 23 At the last they came to Marah: but they could not drink of the waters for bitterness, for they were bitter. Therefore the name of the place was called Marah. 24 Then the people murmured against Moses, saying, "What shall we drink?" 25 And Moses cried unto the LORD, and he showed him a tree: and he cast it into the water, and they waxed sweet. There he made them an ordinance and a law, and there he tempted them, 26 and said, "If ye will hearken unto the voice of the LORD your God, and will do that which is right in his sight and will give an ear unto his commandments, and keep all his ordinances: then will I put none of these diseases upon thee which I brought upon the Egyptians, for I am the LORD thy surgeon."
27 And they came to Elim, where were twelve wells of water and seventy date trees, and they pitched there by the water.