22 Then Moses led Israel onward from the Red Sea, and they went into the wilderness of Shur; they went three days in the wilderness and found no water. 23 When they came to Marah, they could not drink the water of Marah because it was bitter; therefore it was named Marah. 24 And the people murmured against Moses, saying, “What shall we drink?” 25 And he cried to the Lord; and the Lord showed him a tree, and he threw it into the water, and the water became sweet.

There the Lord made for them a statute and an ordinance and there he proved them,