Scripture teaches that the unbeliever, those who reject God/Jesus Christ, perish.
They will be utterly destroyed. Remember John 3:16? I guess not. Here is a reminder:
The death referred to is the death of the spirit. Eternal seperation from God. Forever and ever. We don't understand spiritual death because liken it to the death of the body, which is perishable. But here's a thought, if the punishment were to be not eternal, might that also apply to the concept of eternal life? Eternal is eternal be it spiritual wickedness or spiritual purity.
Isaiah 66:22-24
For as the new heavens and the new earth that I make shall remain before me, says the LORD, so shall your offspring and your name remain. From new moon to new moon, and from Sabbath to Sabbath, all flesh shall come to worship before me, declares the LORD.
And they shall go out and look on the dead bodies of the men who have rebelled against me. For
their worm shall not die, their fire shall not be quenched, and they shall be an abhorrence to all flesh.
Daniel 12:1-2
At that time shall arise Michael, the great prince who has charge of your people. And there shall be a time of trouble, such as never has been since there was a nation till that time. But at that time your people shall be delivered, everyone whose name shall be found written in the book. And many of those who sleep in the dust of the earth shall awake, some to
everlasting life, and some to shame and
everlasting contempt.
Matthew 18:6-9
Whoever receives one such child in my name receives me, but whoever causes one of these little ones who believe in me to sin, it would be better for him to have a great millstone fastened around his neck and to be drowned in the depth of the sea. Woe to the world for temptations to sin! For it is necessary that temptations come, but woe to the one by whom the temptation comes! And if your hand or your foot causes you to sin, cut it off and throw it away. It is better for you to enter life crippled or lame than with two hands or two feet to be thrown into
the eternal fire. And if your eye causes you to sin, tear it out and throw it away. It is better for you to enter life with one eye than with two eyes to be thrown into
the hell of fire.
2 Thess 1:5-10
This is evidence of the righteous judgment of God, that you may be considered worthy of the kingdom of God, for which you are also suffering—since indeed God considers it just to repay with affliction those who afflict you, and to grant relief to you who are afflicted as well as to us, when the Lord Jesus is revealed from heaven with his mighty angels in flaming fire, inflicting vengeance on those who do not know God and on those who do not obey the gospel of our Lord Jesus. They will suffer
the punishment of eternal destruction, away from the presence of the Lord and from the glory of his might, when he comes on that day to be glorified in his saints, and to be marveled at among all who have believed, because our testimony to you was believed.
Luke 16:19-31
The Rich Man and Lazarus
19 “There was a rich man who was dressed in purple and fine linen and lived in luxury every day. 20 At his gate was laid a beggar named Lazarus, covered with sores 21 and longing to eat what fell from the rich man’s table. Even the dogs came and licked his sores.
22 “The time came when the beggar died and the angels carried him to Abraham’s side. The rich man also died and was buried. 23 In Hades, where he was in torment, he looked up and saw Abraham far away, with Lazarus by his side. 24 So he called to him, ‘Father Abraham, have pity on me and send Lazarus to dip the tip of his finger in water and cool my tongue, because I am in agony in this fire.’
25 “But Abraham replied, ‘Son, remember that in your lifetime you received your good things, while Lazarus received bad things, but now he is comforted here and you are in agony. 26 And besides all this, between us and you a great chasm has been set in place, so that those who want to go from here to you cannot, nor can anyone cross over from there to us.’
27 “He answered, ‘Then I beg you, father, send Lazarus to my family,28 for I have five brothers. Let him warn them, so that they will not also come to this place of torment.’
29 “Abraham replied, ‘They have Moses and the Prophets; let them listen to them.’
30 “‘No, father Abraham,’ he said, ‘but if someone from the dead goes to them, they will repent.’
31 “He said to him, ‘If they do not listen to Moses and the Prophets, they will not be convinced even if someone rises from the dead.’”
Doesn't sound like he was burning up to me. He was very much alive and conscious, and in torment.