God revealed himself in literal fire a number of times. He appeared in a burning bush to Moses, Exodus 3:1-6. Fire came out of the tabernacle from before the Lord and consumed upon the altar the burnt offering .. and the people shouted and fell upon their face, Leviticus 9:24. This in the inauguration of the Aaronic priesthood.
But some thought to mimic this procedure and thought to rebel against what the Lord had decreed. And fire came out from the Lord and devoured them and they died before the Lord, Leviticus 10:2.
Came out from the Lord ... and they died before the Lord.
For the Lord thy God is consuming fire, Deuteronomy 4:24.
For our God is consuming fire, Hebrews 12:29.
In both the original Hebrew and in the original Greek there is no grammar in the way, there is no verb : it is stated as an equivalence - "the God of us - consuming fire".
It is what he is.
Either to purge and purify : or to utterly consume.
That which conforms to him is purified and purged.
This was made clear to Abraham : 'Walk before me and be thou perfect', Genesis 17:1.
It was said to the children of Israel : '... be holy for I am holy', Leviticus 11:44.
It is said by Peter to scattered strangers : 'Be ye holy for I am holy', 1 Peter 1:16.
That which does not submit, will not be made perfect, and shall be (eventually) consumed.
There is no alternative.
For God is whom he is.
That is why justification by faith is not a matter of 'human righteousness' (which does not exist) but is a matter of 'the righteousness of God', so described ten times in the Greek New Testament scriptures. God's righteousness was demonstrated and was resolved and was fully satisfied at Golgotha, by the sacrificial offering of the Son of God, Jesus Christ.
Redemption having been accomplished, there remains the fate of that which has 'not submitted to the righteousness of God', Romans 10:3.
We are told by Jesus that at the end of time, the stars shall fall to the earth, Mark 13:25 and John reiterates this, having seen it in vision, Revelation 6:13.
We are told by Peter that in the day of the Lord, the elements shall melt with fervent heat, 2 Peter 3:10.
If the stars fall to earth and if the elements of matter are reduced to their basic structure, then this is what we call a plasma, the fourth state of matter (other than solid, liquid and gas) and the most abundant form of matter in the universe, see Wikipedia - Plasma.
We are told that the wicked shall arise from the dead in the day of judgment and shall be judged according to their works, John 5:29, and Jesus tells us that they shall be consigned to the lake of fire into which Diabolos and his angels have already been cast, Matthew 25:41.
The Apostle John confirms this in vision, Revelation 20:10 and 15.
There can be no doubt that the end of the first creation results in a conflagration of the entirety of its contents and that the result is a plasma that is self-sustaining.
Anyone who does not escape this event, will be trapped in it, in a resurrected body, which cannot be further modified or changed, and which will continue, without ceasing, for ever and ever, aeon upon aeon, aeons of aeons . . . . . .
But those who are called are exhorted to 'lay hold on eternal life', 1 Timothy 6:12.
And we are assured that those who have turned from idols to serve the living and true God, and to wait for His Son from heaven, whom God raised from the dead, are they who are already delivered from the wrath which is to come, 1 Thessalonians 1:10.
... even Jesus, which delivered us from the wrath to come [1 Thess 1:10 KJV]