OUR FATHER WHO FIRST JUDGES HIS OWN PEOPLE
Jude chapter 1 verse 6 says this;
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,
Verse 7 continues this way;
just as Sodom and Gomorrah and the cities around them, since they in the same way as these indulged in gross immorality and went after strange flesh, are exhibited as an example in undergoing the punishment of eternal fire.
These two verses are brought up as a warning to the believers in Jesus.
At that time, the church was being infiltrated by people who were bringing in doctrines of licentiousness and outright denial of the Lord Jesus Christ.
Jude warns his readers that being believers would not exempt them from judgement if they succumbed to these false doctrines.
To emphasize this, Jude references the judgement of imprisonment that was exacted upon angels who trespassed into territories they had no authorization to be in.
Likewise, the cities on the plains like Sodom and Gomorah crossed the boundary of immorality and thus were set up as explicit examples of judgement for their conduct of assaulting visitors to their city with impunity.
May the Lord keep us for falling for the false doctrines that take advantage of God grace to perpetuate sin and the false doctrine that denies the lordship of the Jesus Christ.