1 Enoch 6:1-8

1. And it came to pass when the children of men had multiplied that in those days were born unto them beautiful and comely daughters. 2. And the angels, the children of the heaven, saw and lusted after them, and said to one another: 'Come, let us choose us wives from among the children of men and beget us children.' 3. 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.' 4. 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.' 5. Then sware they all together and bound themselves by mutual imprecations upon it. 6. And they were in all two hundred; who descended ⌈in the days⌉ of Jared on the summit of Mount Hermon, and they called it Mount Hermon, because they had sworn and bound themselves by mutual imprecations upon it. 7. And these are the names of their leaders: Sêmîazâz, their leader, Arâkîba, Râmêêl, Kôkabîêl, Tâmîêl, Râmîêl, Dânêl, Êzêqêêl, Barâqîjâl, Asâêl, Armârôs, Batârêl, Anânêl, Zaqîêl, Samsâpêêl, Satarêl, Tûrêl, Jômjâêl, Sariêl. 8. These are their chiefs of tens.

Legends of the Jews 1:3

The depravity of mankind, which began to show itself in the time of Enosh, had increased monstrously in the time of his grandson Jared, by reason of the fallen angels. When the angels saw the beautiful, attractive daughters of men, they lusted after them, and spoke: "We will choose wives for ourselves only from among the daughters of men, and beget children with them." Their chief Shemhazai said, "I fear me, ye will not put this plan of yours into execution, and I alone shall have to suffer the consequences of a great sin." Then they answered him, and said: "We will all swear an oath, and we will bind ourselves, separately and together, not to abandon the plan, but to carry it through to the end." Two hundred angels descended to the summit of Mount Hermon, which owes its name to this very occurrence, because they bound themselves there to fulfil their purpose, on the penalty of Herem, anathema. Under the leadership of twenty captains they defiled themselves with the daughters of men, unto whom they taught charms, conjuring formulas, how to cut roots, and the efficacy of plants. The issue from these mixed marriages was a race of giants, three thousand ells tall, who consumed the possessions of men. When all had vanished, and they could obtain nothing more from them, the giants turned against men and devoured many of them, and the remnant of men began to trespass against the birds, beasts, reptiles, and fishes, eating their flesh and drinking their blood. Then the earth complained about the impious evil-doers. But the fallen angels continued to corrupt mankind. Azazel taught men how to make slaughtering knives, arms, shields, and coats of mail. He showed them metals and how to work them, and armlets and all sorts of trinkets, and the use of rouge for the eyes, and how to beautify the eyelids, and how to ornament themselves with the rarest and most precious jewels and all sorts of paints.