XV. (79) Now there are twelve tribes of the nation, and one of them having been selected from the others for its excellence has received the priesthood, receiving this honour as a reward for its virtue, and fidelity, and its devout soul, which it displayed when the multitude appeared to be running into sin, following the foolish choices of some persons who persuaded their countrymen to imitate the vanity of the Egyptians, and the pride of the nations of the land, who had invented fables about irrational animals, and especially about bulls, making gods of them. For this tribe did of its own accord go forth and slay all the leaders of this apostacy from the youth upwards, in which they appeared to have done a holy action, encountering thus a contest and a labour for the sake of piety.