Jude says angels who “did not stay within their own position of authority” were kept in “eternal chains under gloomy darkness” Jude 1:6. He connects this to “the judgment of the great day” Jude 1:6.
In Jude 1:5–7 Jude calls his readers to remember three well-known past judgments. First, the Lord rescued a people from Egypt yet later destroyed those who refused to trust. Second, certain angels abandoned their assigned place and are now held in dark custody awaiting a coming day of judgment. These verses follow Jude’s warning that certain people have slipped in and are twisting the community’s life and message (verses 3–4). Jude’s strategy here is not to introduce new information but to re-activate shared memory: “you already know this,” yet you need it brought back to mind.
Jude 1:5–7 works as a set of reminders.
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Jude 1:6, then read the surrounding section so the answer stays connected to the passage's flow.
6Angels who didn`t keep their first domain, but deserted their own dwelling place, he has kept in everlasting bonds under darkness for the judgment of the great day.