1 Enoch 10:1
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.
2 Peter 2:4
3 And in their greed they will exploit you with deceptive words. Their condemnation pronounced long ago is not sitting idly by; their destruction is not asleep. 4 For if God did not spare the angels who sinned, but threw them into Tartarus16 and locked them up in chains in utter darkness, to be kept until the judgment, 5 and if he did not spare the ancient world, but did protect Noah, a herald of righteousness, along with seven others, when God brought a flood on an ungodly world,
Notes and References
"... The binding language is the source of the same in New Testament passages about the “angels that sinned” (2 Peter 2:4; Jude 6). Second Peter 2:4 is especially noteworthy: “For if God did not spare angels when they sinned, but cast them into hell and committed them to chains of gloomy darkness to be kept until the judgment.” The Greek verb rendered “cast into hell” is tartaroō, the verb found in the classical Greek story for the destination of the rebel Titans, a tale with clear relationships to the apkallu story that provides the original context for Genesis 6:1–4 ..."
Heiser, Michael S. A Companion to the Book of Enoch: A Reader’s Commentary, Vol. 1 (p. 115) Defender Publishing, 2019