1 Enoch 10:8

1 Then said the Most High, the Holy and Great One spake, and sent Uriel to the son of Lamech, and said to him: 2 '〈Go to Noah〉 and tell him in my name "Hide thyself!" and reveal to him the end that is approaching: that the whole earth will be destroyed, and a deluge is about to come upon the whole earth, and will destroy all that is on it. 3 And now instruct him that he may escape and his seed may be preserved for all the generations of the world.' 4 And again the Lord said to Raphael: 'Bind Azâzêl hand and foot, and cast him into the darkness: and make an opening in the desert, which is in Dûdâêl, and cast him therein. 5 And place upon him rough and jagged rocks, and cover him with darkness, and let him abide there for ever, and cover his face that he may not see light. 6 And on the day of the great judgement he shall be cast into the fire. And heal the earth which the angels have corrupted, and proclaim the healing of the earth, that they may heal the plague, and that all the children of men may not perish through all the secret things that the Watchers have disclosed and have taught their sons. 8 And the whole earth has been corrupted through the works that were taught by Azâzêl: to him ascribe all sin.' 9 And to Gabriel said the Lord: 'Proceed against the bastards and the reprobates, and against the children of fornication: and destroy [the children of fornication and] the children of the Watchers from amongst men [and cause them to go forth]: send them one against the other that they may destroy each other in battle: for length of days shall they not have. 10 And no request that they (i.e. their fathers) make of thee shall be granted unto their fathers on their behalf; for they hope to live an eternal life, and that each one of them will live five hundred years.' 11 And the Lord said unto Michael: 'Go, bind Semjâzâ and his associates who have united themselves with women so as to have defiled themselves with them in all their uncleanness.

Dead Sea Scrolls

Interpretation concerning the ages made by God, all the ages for the accomplishment [of all the events, past] and future. Before ever He created them, He determined the works of ... age by age. And it was engraved on [heavenly] tablets... the ages of their domination. This is the order of the cre[ation of man from Noah to Abraham, un]til he begot Isaac; ten [weeks (of years)]. And the interpretation concerns Azazel and the angels who [came to the daughters of men; and] they bore to them giants. And concerning Azazel ... and iniquity, and to cause them all to inherit wickedness... judgements and judgement of the congregation.