Jude 1:7 clearly says(and I'll post multiple translations)
King James Version - Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.
New International Version - In a similar way, Sodom and Gomorrah and the surrounding towns gave themselves up to sexual immorality and perversion. They serve as an example of those who suffer the punishment of eternal fire.
English Standard Version - just as Sodom and Gomorrah and the surrounding cities, which likewise indulged in sexual immorality and pursued unnatural desire,[a] serve as an example by undergoing a punishment of eternal fire.
New American Standard Bible - 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 [a]strange flesh, are exhibited as an [b]example in undergoing the punishment of eternal fire.
Original Language, ὡς Σόδομα καὶ Γόμορρα καὶ αἱ περὶ αὐτὰς πόλεις, τὸν ὅμοιον [a]τρόπον τούτοις ἐκπορνεύσασαι καὶ ἀπελθοῦσαι ὀπίσω σαρκὸς ἑτέρας, πρόκεινται δεῖγμα πυρὸς αἰωνίου δίκην ὑπέχουσαι.
So Sodom and Gomorrah are an Example of what eternal fire is, What happened to Sodom and Gomorrah? They were Annihilated, made Nonexistent.
Lake of Fire now, watch
Revelation 20:14 and I'll use the King James Version because of the King James Version Onlyist,
Revelation 20:14 And death and hell were cast into the lake of fire. This is the second death.
Death is the Punishment of Sin, Romans 6:23 - For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord. don't make up definitions for the words, Death in Greek... Means Death, Death is not a "separate of Spirit and Body" this is an Atheist lie.
There's a Difference, Jesus Christ said, Matthew 25:46 - ""Then they will go away to eternal punishment, but the righteous to eternal life.""
The Lord(YHWH, Jesus Christ) didn't say they Both go to eternal life, no, evil go to Eternal Punishment(Death) while Only Righteous get Eternal Life, Eternal Life is the Reward, the ones punished do not get that reward, they don't want YHWH(The Father and The Son and The Holy Spirit)/Life, so they don't get Him..
The Punishment of Sin is... Death, Bible says it, That settles it, hold to Universalism and you hold to immorality as not everyone will repent, Hold to Eternal Fire and you're either an "atheist" who Wants The Bible to have the Doctrine of Eternal Torment just so you have an excuse against The Bible, a Pharisee, or just an evil person who desires this.
YHWH(The Father and The Son and The Holy Spirit) is Just, Punishment of Sin is fair, Death,
Jeremiah 21:14 - "But I will punish you according to the fruit of your doings, saith the LORD: and I will kindle a fire in the forest thereof, and it shall devour(Devour, destroy, not go on for eternity) all things round about it." - YHWH(The Father and The Son and The Holy Spirit)
Also, Ezekiel 18:23 - "Do I take any pleasure in the death of the wicked? declares the Sovereign LORD(YHWH). Rather, am I not pleased when they turn from their ways and live?" - YHWH - The Father and The Son and The Holy Spirit