Exodus 3:1

Fed for the space of forty years. During which time, he composed the books of Genesis and Job, for the consolation of his countrymen; (Menochius) though others believe he wrote all the Pentateuch in the desert. (Theodoret; &c.) --- Of God, on account of its height; or on account of God's appearing to Moses. --- Horeb is so close to Mount Sinai, that the shadow of the latter reaches it when the sun rises. It is watered with three springs; and the summit is adorned with fruit trees. (Calmet)