1st Book of Enoch Chapt. 7- 8

Chapt. 7 :The fallen angels have breed with the daughters of men and taught them how to deceive with beautifying, and bore giants the size of skyscrapers. These offspring where fowl, vile, cretines that sin against the fish, birds, animals and devoured men and drank there blood. They even performed cannidbolism. Chapter: 8 is the forbidden knowledge that is equivalent to our modern day astrology, sun and moon worship, witchcraft, ritual spells and incantation. These fallen angels present this as a gift when it will only bring death to mankind, the knowledge of evil.