Vengeance] RV 'punishment.' The fire may be called eternal, because the destruction wrought by it remains. The Gk., however, would allow us to take example with of eternal fire—' as an example of eternal fire, suffering punishment' (RM).
Related Commentaries of Jude 1:7
Jude 1:7
7 Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strangeb flesh, are set forth for an example, suffering the vengeance of eternal fire.