De Agricultura
Philo Judaeus
The works of Philo Judaeus, the contemporary of Josephus, volume 1. Yonge, C. D., translator. London: Henry G. Bohn, 1854.
Moses, therefore, represents the serpent that appeared to Eve as planning the death of man, for he records, that God says in his curses, "He shall bruise thy head, and thou shalt bruise his heel." But he represents the serpent of Dan, which is the one which we are now discussing, as biting the heel of the horse and not of the man,