just as Sodom and Gomor′rah and the surrounding cities, which likewise acted immorally and indulged in unnatural lust, serve as an example by undergoing a punishment of eternal fire.
ὡς Σόδομα καὶ Γόμορρα καὶ αἱ περὶ αὐτὰς πόλεις τὸν ὅμοιον τρόπον τούτοις ἐκπορνεύσασαι καὶ ἀπελθοῦσαι ὀπίσω σαρκὸς ἑτέρας, πρόκεινται δεῖγμα πυρὸς αἰωνίου δίκην ὑπέχουσαι.
Haydock Catholic Bible Commentary: Jude
Principality. That is, the state in which they were first created, their original dignity. Ch. — Having given themselves over to fornication, or to excessive uncleanness. — Going after other flesh, and seeking unnatural lusts, with those of the same sex. Wi. — Impurity punished by fire and sulphur. Fire is a punishment proportioned to the criminal passion of the voluptuous. That of Sodom was most dreadful, but then it was of short duration. There is another fire that will never be extinguished.