2 Peter 2:4
For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment;
This is how it actually sounds in the closest translation to the Greek.
2 Peter 2:4
For if God messengers who sinned did not spare, but with chains of thick gloom, having cast [them] down to Tartarus, did deliver [them] to judgment, having been reserved,
Now if you actually do a bit of research to the word Tartarus, this is what you will note.
“Tartarus occurs in the Septuagint of Job, but otherwise is only known in Hellenistic Jewish literature from the Greek text of 1 Enoch, dated to 400–200 BC. This states that God placed the archangel Uriel “in charge of the world and of Tartarus” (20:2).
Tartarus is generally understood to be the place where 200 fallen Watchers (angels) are imprisoned.
Tartarus also appears in sections of the Jewish Sibylline Oracles. E.g. Sib. Or. 4:186.”
In the New Testament, the noun Tartarus does not occur but tartaroo (ταρταρόω, “throw to Tartarus”), a shortened form of the classical Greek verb kata-tartaroo (“throw down to Tartarus”), does appear in 2 Peter 2:4. Liddell–Scott provides other sources for the shortened form of this verb, including Acusilaus (5th century BC), Joannes Laurentius Lydus (4th century AD) and the Scholiast on Aeschylus’ Eumenides, who cites Pindar relating how the earth tried to tartaro “cast down” Apollo after he overcame the Python. In classical texts, the longer form kata-tartaroo is often related to the throwing of the Titans down to Tartarus.”
Herein you will begin to understand a few things.
No. 1. It is partially mythology and it’s for an archaic world which existed during Noah’s time.
No. 2. By the time Peter refers to it was already Greek mythology.
No. 3. Peter was not saying unbelievers would go there.
See what he says.
2 Peter 2:6
and the cities of Sodom and Gomorrah having turned to ashes, with an overthrow did condemn, an example to those about to be impious having set [them];
Note this is not referring to Tartarus.
2 Peter 2:7
and righteous Lot, worn down by the conduct in lasciviousness of the impious, He did rescue,
Neither is this. But note the emphasis Peter makes is about who is saved and not who perishes.
Now see his point.
2 Peter 2:9
The Lord hath known to rescue pious ones out of temptation, and unrighteous ones to a day of judgment, being punished, to keep,
In the NIV he says.
2 Peter 2:9
if this is so, then the Lord knows how to rescue the godly from trials and to hold the unrighteous for punishment on the day of judgment.
So you see these “unbelievers” don’t actually go to Tartarus. They face judgment on the day of judgment.
So now when you turn to Matthew 25 and Revelation these are what the verses say.
“Then he will say to those on his left, ‘Depart from me, you who are cursed, into the eternal fire prepared for the devil and his angels.
And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever.
So you see it’s so easy to think all three passages refer to the same place.
Except it doesn’t.
Peter in contrast with Matthew and John were referring to different places.
Peter was speaking about the archaic world at the time of Noah before Jesus became incarnate.
Jesus and John were referring to places in their future. If you read Revelation 12 you will realize the devil John refers to had 7 heads and 10 horns.
Then another sign appeared in heaven: an enormous red dragon with seven heads and ten horns and seven crowns on its heads.
These are what the 7 heads mean.
“This calls for a mind with wisdom. The seven heads are seven hills on which the woman sits. They are also seven kings. Five have fallen, one is, the other has not yet come; but when he does come, he must remain for only a little while.
Notice 7 hills 7 kings. There were only 2 places with 7 hills at that time. Rome and Jerusalem.
Now if you read Matthew 25 and the parable of the sheep and the goats you will realize it only appears in Matthew and no other gospel. It is written to the Jews exclusively.
It was written to warn them about how the Jews should respond to the apostles who were his brothers about their message to the Jews to flee Jerusalem in AD70.
Jesus said, “Do not hold on to me, for I have not yet ascended to the Father. Go instead to my brothers and tell them, ‘I am ascending to my Father and your Father, to my God and your God.’”
Note Jesus called the apostles brothers.
So when you read about this “devil and his angels” in Matthew and Revelation, it is referring to old covenant Israel or old covenant Jerusalem.
Not a future hell.