"And he made a plan with his powers. He sent his angels to the daughters of men, that they might take some of them for themselves and raise offspring for their enjoyment. And at first they did not succeed."
http://www.gnosis.org/naghamm/apocjn.html
"…And Semjâzâ, who was their leader, said unto them: “I fear ye will not indeed agree to do this deed, and I alone shall have to pay the penalty of a great sin.” And they all answered him and said: “Let us all swear an oath, and all bind ourselves by mutual imprecations not to abandon this plan but to do this thing.”
https://www.ancient-code.com/the-book-of-enoch-and-the-nephilim/
"when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown."
https://biblehub.com/kjv/genesis/6.htm
"In the Book of Enoch it says that the leader of the fallen angels was called Azazel, and he is often identified with Lucifer (the Lightbringer) or Lumiel (‘the light of God’). He taught men to forge swords and make shields and breastplates (body armour). Azazel also taught them metallurgy and how to mine from the earth and use different metals. To the women he taught the art of making bracelets, ornaments, rings and necklaces from precious metals and stones. He also showed them how to ‘beautify their eyelids’ with kohl and the use of cosmetic tricks to attract and seduce the opposite sex."
"The fallen angel Shemyaza, another form of Azazel, is said by Enoch to have taught humans the use of root cuttings and the magical art of enchantment; the fallen angel Armaros taught the resolving (banishing) of enchantments; Baraqijal taught astrology; Kokabiel, the knowledge of the constellations (astronomy); Chazaqiel, the knowledge of the clouds and the sky (weather lore and divination); Shamsiel, the signs of the sun (the solar mysteries); Sariel the courses of the moon (the lunar cycles used in horticulture and agriculture and the esoteric lunar mysteries); Penemuel instructed humans in the art of writing and reading; and Kashdejan taught the diagnosis and healing of diseases and the science of medicine."
https://www.newdawnmagazine.com/articles/enoch-the-watchers-the-real-story-of-angels-demons