Forty days and forty nights Moses now devoted to the study of the Torah, and in all the time he ate no bread and drank no water, acting in accordance with the proverb, "If thou enterest a city, observe its laws." The angels followed this maxim when they visited Abraham, for they there ate like men; and so did Moses, who being among angels, like the angels partook of no food. He received nourishment from radiance of the Shekinah, which also sustains the holy Hayyot that bear the Throne. Moses spent the day in learning the Torah from God, and the night in repeating what he had learned. In this way he set an example for Israel, that they might occupy themselves with the Torah by night and by day.