After the marvelous deliverance from Egypt and the opening up of the Red Sea, the children of Israel begin their pilgrimage toward the Promised Land with optimism and hope. Three days later, however, they find themselves dying of thirst, and are filled with indignation when they discover that the water at Marah is impure. Moses intercedes before God and he is shown how to make the water pure. Later, they complain that they have no food, but once again, Moses intercedes for them before God, resulting in the miraculous supply of manna. While at Rephidim, they complain because they have no water. Moses, in anger, strikes the rock. Finally, Jethro, Moses’ father-in-law, persuades Moses to delegate some of his responsibilities.