Moses asked the LORD for help, and the LORD told him to throw a piece of wood into the water. Moses did so, and the water became fit to drink. At Marah the LORD tested his people and also gave them some laws and teachings.
So Moses finished telling the Israelites what they had to do in order to keep the agreement the LORD was making with them in Moab, which was in addition to the one the LORD had made with them at Mount Sinai.
Joshua called the tribes of Israel together for a meeting at Shechem. He made the leaders, including the old men, the judges, and the officials, come up and stand near the sacred tent.