"and they encamped there by the waters": R. Elazar Hamodai says: When the Holy One Blessed be He created His world, He created twelve springs, corresponding to the twelve tribes of Jacob, and seventy date-palms, corresponding to the seventy elders. What is the intent of "and they encamped there by the water"? They preoccupied themselves there with the study of the (sections of the) Torah which had been given to them at Marah.