22 Then Moses led the people of Israel away from the Red Sea, and they moved out into the desert of Shur. They traveled in this desert for three days without finding any water. 23 When they came to the oasis of Marah, the water was too bitter to drink. So they called the place Marah (which means "bitter"). 24 Then the people complained and turned against Moses. "What are we going to drink?" they demanded. 25 So Moses cried out to the Lord for help, and the Lord showed him a piece of wood. Moses threw it into the water, and this made the water good to drink. It was there at Marah that the Lord set before them the following decree as a standard to test their faithfulness to him. 26 He said, "If you will listen carefully to the voice of the Lord your God and do what is right in his sight, obeying his commands and keeping all his decrees, then I will not make you suffer any of the diseases I sent on the Egyptians; for I am the Lord who heals you." 27 After leaving Marah, the Israelites traveled on to the oasis of Elim, where they found twelve springs and seventy palm trees. They camped there beside the water.
Matthew Henry's Commentary on Exodus 15:22-27
Commentary on Exodus 15:22-27
(Read Exodus 15:22-27)
In the wilderness of Shur the Israelites had no water. At Marah they had water, but it was bitter; so that they could not drink it. God can make bitter to us that from which we promise ourselves most, and often does so in the wilderness of this world, that our wants, and disappointments in the creature, may drive us to the Creator, in whose favour alone true comfort is to be had. In this distress the people fretted, and quarrelled with Moses. Hypocrites may show high affections, and appear earnest in religious exercises, but in the time of temptation they fall away. Even true believers, in seasons of sharp trial, will be tempted to fret, distrust, and murmur. But in every trial we should cast our care upon the Lord, and pour out our hearts before him. We shall then find that a submissive will, a peaceful conscience, and the comforts of the Holy Ghost, will render the bitterest trial tolerable, yea, pleasant. Moses did what the people had neglected to do; he cried unto the Lord. And God provided graciously for them. He directed Moses to a tree which he cast into the waters, when, at once, they were made sweet. Some make this tree typical of the cross of Christ, which sweetens the bitter waters of affliction to all the faithful, and enables them to rejoice in tribulation. But a rebellious Israelite shall fare no better than a rebellious Egyptian. The threatening is implied only, the promise is expressed. God is the great Physician. If we are kept well, it is he that keeps us; if we are made well, it is he that recovers us. He is our life and the length of our days. Let us not forget that we are kept from destruction, and delivered from our enemies, to be the Lord's servants. At Elim they had good water, and enough of it. Though God may, for a time, order his people to encamp by the bitter waters of Marah, that shall not always be their lot. Let us not faint at tribulations.