There was one other difficulty with the people that Moses had to overcome: The sea cast up many jewels, pearls and other treasures that had belonged to the Egyptians, drowned in its waves, and Israel found it hard to tear themselves away from the spot that brought them such riches. Moses, however, said, "Do you really believe that the sea will continue to yield you pearls and jewels?"
From the sea they passed to the desert Shur, a horrible and dreadful wilderness, full of snakes, lizards, and scorpions, extending over hundreds of miles. So deadly is the nature of the snakes that dwell in the desert, that if one of them merely glides over the shadow of a flying bird, the bird falls into pieces. It was in this desert that the following happened to King Shapor: A cohort that he sent through this desert was swallowed by a snake, and the same fate overtook a second and a third cohort. Upon the advice of his sages, he then filled the hides of animals with hot coals wrapped in straw, and had these cast before the snake until it expired.