(New American Standard Bible)
And angels who did not keep their own domain, but abandoned their proper abode, He has kept in eternal bonds under darkness for the judgment of the great day
(New Living Translation)
And I remind you of the angels who did not stay within the limits of authority God gave them but left the place where they belonged. God has kept them securely chained in prisons of darkness, waiting for the great day of judgment.
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Jude continues in verse 6 with more reminders. He specifically reflects on the angels who chose to be faithless to God. He had entrusted them with His plan, and they turned in sin away from Him and His commands.
I wish I had time today to dig deeper into this verse, because it is filled with controversy that has been topic of much debate. Life is messy today, and my time is limited. Below you will find a couple of screen captures from Blue Letter Bible delving into verse 6. David Guzik does a fantastic job of explaining.
Here is the link, if you'd like to study it more: Blue Letter Bible: David Guzik Commentary
Pay attention to the last snap and last paragraph. There will be those who will cause trouble. They might be people who were born of this earth, or they could be fallen angels.
While all this seems troublesome, and honestly makes me weary thinking about all the ugly in this world, lets stay focused not on these things. We must maintain our relationship with Jesus by staying in His Word, and connecting daily with our Father, God. Ultimately, His Plan will prevail. PS...if you haven't read the book of Revelation, I will give you a hint: Good Overcomes Evil; hence, we win. ツ
What stood out most to you in this verse?