Exodus

²²And Moses led Israel onward from the Red Sea, and they went out into the wilderness of Shur; and they went three days in the wilderness, and found no water. ²³And when they came to Marah, they could not drink of the waters of Marah, for they were bitter: therefore the name of it was called Marah. ²⁴And the people murmured against Moses, saying, What shall we drink? ²⁵And he cried unto the Lord; and the Lord shewed him a tree, and he cast it into the waters, and the waters were made sweet. There he made for them a statute and an ordinance, and there he proved them; ²⁶and he said, If thou wilt diligently hearken to the voice of the Lord thy God, and wilt do that which is right in his eyes, and wilt give ear to his commandments, and keep all his statutes, I will put none of the diseases upon thee, which I have put upon the Egyptians: for I am the Lord that healeth thee. ²⁷And they came to Elim, where were twelve springs of water, and threescore and ten palm trees: and they encamped there by the waters.