Certainly if God did not hold back from punishing the angels that sinned, but, by throwing them into Tartarus, delivered them to pits of dense darkness to be reserved for judgment;

2 Peter 2:3-10.

11. (a) What happened to the disobedient angels, and what still awaits them? (b) What is proved by the punishment of the angels, the destruction of the ungodly in the Flood, and the annihilation of the inhabitants of Sodom and Gomorrah?

¹¹ As Peter noted, even angels who had enjoyed being in the very presence of God but who later became unfaithful were not spared being ‘thrown into Tartarus,’ that is, debased to the lowest degree. Cut off from all divine enlightenment, debarred from their original position in the heavens and limited in their activities, the disobedient angels find themselves in a condition comparable to “pits of dense darkness,” awaiting executional judgment at the hands of Jesus Christ. (Compare Revelation 20:1-3, 7-10.)