Exodus 15:20-27
15:20 Miriam the prophetess, the sister of Aaron, took a hand-drum in her hand, and all the women went out after her with hand-drums and with dances.
15:21 Miriam sang in response to them, “Sing to the Lord, for he has triumphed gloriously; the horse and its rider he has thrown into the sea.”
The Bitter Water
15:22 Then Moses led Israel to journey away from the Red Sea. They went out to the Desert of Shur, walked for three days into the desert, and found no water.
15:23 Then they came to Marah, but they were not able to drink the waters of Marah, because they were bitter. (That is why its name was Marah.)
15:24 So the people murmured against Moses, saying, “What can we drink?”
15:25 He cried out to the Lord, and the Lord showed him a tree. When Moses threw it into the water, the water became safe to drink. There the Lord made for them a binding ordinance, and there he tested them.
15:26 He said, “If you will diligently obey the Lord your God, and do what is right in his sight, and pay attention to his commandments, and keep all his statutes, then all the diseases that I brought on the Egyptians I will not bring on you, for I, the Lord, am your healer.”
15:27 Then they came to Elim, where there were twelve wells of water and seventy palm trees, and they camped there by the water.