 Another famous work, the early "Sefer Yetzirah", is dated back to the patriarch Abraham.This tendency toward pseudepigraphy has its roots in apocalyptic literature, which claims that esoteric knowledge such as magic, divination and astrology was transmitted to humans in the mythic past by the two angels, Aza and Azaz'el (in other places, Azaz'el and Uzaz'el) who fell from heaven (see Genesis 6