In 1 Enoch and 3 Enoch
The whole earth has been corrupted through the works that were taught by Azazel: to him ascribe all sin.
— Book of Enoch 10:8
According to the Book of Enoch (a book of the Apocrypha), Azazel (here spelled ‘ăzā’zyēl) was one of the chief Grigori, a group of fallen angels who married women. This same story (without any mention of Azazel) is told in the book of Genesis 6:2–4: "That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. […] There were giants in the earth in those days; and also afterward, when the sons of God came in unto the daughters of men, and they bore children to them, the same became mighty men which were of old, men of renown."
Enoch portrays Azazel as responsible for teaching people to make weapons and cosmetics, for which he was cast out of heaven. The Book of Enoch 8:1–3a reads, "And Azazel taught men to make swords and knives and shields and breastplates; and made known to them the metals [of the earth] and the art of working them; and bracelets and ornaments; and the use of antimony and the beautifying of the eyelids; and all kinds of costly stones and all colouring tinctures. And there arose much godlessness, and they committed fornication, and they were led astray and became corrupt in all their ways."
The corruption brought on by Azazel and the Grigori degrades the human race, and the four archangels (Michael, Gabriel, Raphael, and Uriel) “saw much blood being shed upon the earth and all lawlessness being wrought upon the earth […] The souls of men [made] their suit, saying, "Bring our cause before the Most High; […] Thou seest what Azazel hath done, who hath taught all unrighteousness on earth and revealed the eternal secrets which were in heaven, which men were striving to learn."
God sees the sin brought about by Azazel and has Raphael “bind Azazel hand and foot and cast him into the darkness: and make an opening in the desert – which is in Dudael – and cast him therein. And place upon him rough and jagged rocks, and cover him with darkness, and let him abide there forever, and cover his face that he may not see light.”>>3439451