Waters Became Sweet - Exodus 15:22-25

Exodus 15:22-25 NASB 

Then Moses led Israel 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. When they came to Marah, they could not drink the waters of Marah, for they were bitter; therefore it was named Marah. So the people grumbled at Moses, saying, “What shall we drink?” Then he cried out to the Lord, and the Lord showed him a tree; and he threw it into the waters, and the waters became sweet.

There He made for them a statute and regulation, and there He tested them.

God shows Moses a tree that made the bitter water sweet. This prefigures the cross of Christ. Into the bitter waters of fallen man, God sends His Son to hang on another tree, changing all who drink from the fountain of His mercy the sweet water of life. 

Wandering in the desert for three days connects us with the time Jesus spent among the dead in the tomb, the bitter water made so from the sting of death.