As the children of Israel left Egyptian bondage and crossed the Red Sea, they sang a song in Exodus 15. “The Lord is my strength and song, and He has become my salvation; He is my God, and I will praise Him” is an excerpt found in verse 2. God had led them safely across the Sea and caused the chariots of Pharaoh’s army to be swallowed up by the water. They were full of gladness and thanksgiving because of their recent successes. Three days later, after they had passed through the Wilderness of Shur with no water, they came to Marah. However, they were unable to drink its water because it was bitter. They began to complain to Moses. God, in response to Moses’ request, made the water sweet to drink by having a tree cast into the waters. God told the children of Israel, “If you diligently heed the voice of the Lord your God and do what is right in His sight, give ear to His commandments and keep all His statues, I will put none of the diseases on you which I have brought on the Egyptians. For I am the Lord who heals you” (Ex. 15:26).