Justin Martyr- First Apology [a.d. 110-165.]
And that it is better to believe even what is impossible to our own nature and to men, than to be unbelieving like the rest of the world, we have learned; for we know that our Master Jesus Christ said, that "what is impossible with men is possible with God,"42 and, "Fear not them that kill you, and after that can do no more; but fear Him who after death is able to cast both soul and body into hell."43
And hell is a place where those are to be punished who have lived wickedly, and who do not believe that those things which God has taught us by Christ will come to pass
And in what kind of sensation and punishment the wicked are to be, hear from what was said in like manner with reference to this; it is as follows: "Their worm shall not rest, and their fire shall not be quenched; "110 and then shall they repent, when it profits them not. And what the people of the Jews shall say and do, when they see Him coming in glory, has been thus predicted by Zechariah the prophet: "I will command the four winds to gather the scattered children; I will command the north wind to bring them, and the south wind, that it keep not back. And then in Jerusalem there shall be great lamentation, not the lamentation of mouths or of lips, but the lamentation of the heart; and they shall rend not their garments, but their hearts. Tribe by tribe they shall mourn, and then they shall look on Him whom they have pierced; and they shall say, Why, O Lord, hast Thou made us to err from Thy way? The glory which our fathers blessed, has for us been turned into shame."
Justin Martyr- Second Apology [a.d. 110-165.]
For everywhere, whoever is corrected by father, or neighbour, or child, or friend, or brother, or husband, or wife, for a fault, for being hard to move, for loving pleasure and being hard to urge to what is right (except those who have been persuaded that
the unjust and intemperate shall be punished in eternal fire,
A certain woman lived with an intemperate4 husband; she herself, too, having formerly been intemperate. But when she came to the knowledge of the teachings of Christ she became sober-minded, and endeavoured to persuade her husband likewise to be temperate, citing the teaching of Christ, and assuring him that
there shall be punishment in eternal fire inflicted upon those who do not live temperately and conformably to right reason.
But since God in the beginning made the race of angels and men with free-will,
they will justly suffer in eternal fire the punishment of whatever sins they have committed.
And they, having been shut up in eternal fire, shall suffer their just punishment and penalty. For if they are even now overthrown by men through the name of Jesus Christ, this is an intimation of
the punishment in eternal fire which is to be inflicted on themselves and those who serve them. I or thus did both all the prophets foretell, and our own teacher Jesus teach.14
Chapter IX.-Eternal Punishment Not a Mere Threat.
http://www.ccel.org/fathers2/ANF-01/anf01-47.htm#P3966_758753
Irenaeus Against Heresies Book IV [a.d. 120-202.] Disciple of Polycarp who was a disciple of John
So says the apostle, in like manner, in the Epistle to the Thessalonians: "Seeing it is a righteous thing with God to recompense tribulation to them that trouble you; and to you who are troubled rest with us, at the revealing of our Lord Jesus Christ from heaven with His mighty angels, and in a flame of fire, to take vengeance upon those who know not God, and upon those that obey not the Gospel of our Lord Jesus Christ:
who shall also be punished with everlasting destruction from the presence of the Lord, and from the glory of His power; when He shall come to be glorified in His saints, and to be admired in all them who have believed in Him."
Irenaeus Book V
But separation from God is death, and separation from light is darkness; and
separation from God consists in the loss of all the benefits which He has in store. Those, therefore, who cast away by apostasy these forementioned things, being in fact destitute of all good, do experience every kind of punishment. God, however, does not punish them immediately of Himself, but that punishment falls upon them because they are destitute of all that is good. Now,
good things are eternal and without end with God, and therefore the loss of these is also eternal and never-ending.
http://www.ccel.org/fathers2/ANF-01/anf01-62.htm#P7979_2198226
Clement Rome [a.d. 30-100.]
Envy brought down Dathan and Abiram
alive to Hades, through the sedition which they excited against God's servant Moses.
For they went down
alive into Hades, and death swallowed them up.
On account of his hospitality and godliness, Lot was saved out of Sodom when all the country round was punished by means of fire and brimstone, the Lord thus making it manifest that He does not forsake those that hope in Him, but
gives up such as depart from Him to punishment and torture.
http://www.ccel.org/fathers2/ANF-01/anf01-05.htm#P171_20841
Clement Alexandria Exhortation to the Heathen [153-193-217 AD]
And you know not that, of all truths, this is the truest, that the good and godly shall obtain the good reward, in as much as they held goodness in high esteem; while,
on the other hand, the wicked shall receive meet punishment. For the author of evil, torment has been prepared; and so the prophet Zecharias threatens him: "He that hath chosen Jerusalem rebuke thee; lo, is not this a brand plucked from the fire? "120 What an infatuated desire, then, for voluntary death is this, rooted in men's minds! Why do they flee to this fatal brand, with which they shall be burned, when it is within their power to live nobly according to God, and not according to custom? For God bestows life freely; but evil custom,
after our departure from this world, brings on the sinner
unavailing remorse with punishment.
He bestows salvation, you sink down into destruction; He confers everlasting life,
you wait for punishment, and prefer the fire which the Lord "has prepared for the devil and his angels."
http://www.ccel.org/fathers2/ANF-02/anf02-50.htm#P2691_785581
Clement of Alex. The Instructor [Paedagogus] Bk 2
There was a certain man," said the Lord, narrating, "very rich, who was clothed in purple and scarlet, enjoying himself splendidly every day." This was the hay. "And a certain poor man named Lazarus was laid at the rich man's gate, full of sores, desiring to be filled with the crumbs which fell from the rich man's table." This is the grass. Well,
the rich man was punished in Hades, being made partaker of the fire; while the other flourished again in the Father's bosom.
http://www.ccel.org/fathers2/ANF-02/anf02-53.htm#P3706_1120269
The Second Epistle of Clement.
For if we do the will of Christ, we shall find rest; otherwise,
nothing shall deliver us from eternal punishment, if we disobey His commandments. For thus also saith the Scripture in Ezekiel, "If Noah, Job, and Daniel should rise up, they should not deliver their children in captivity."38 Now, if men so eminently righteous are not able by their righteousness to deliver their children, how39 can we hope to enter into the royal residence40 of God unless we keep our baptism holy and undefiled?
http://www.ccel.org/fathers2/ANF-10/anf10-28.htm#P5819_852153
Theophilus to Autolycus Book I. [115-168-181 AD]
Admitting, therefore, the proof which events happening as predicted afford, I do not disbelieve, but I believe, obedient to God, whom, if you please, do you also submit to, believing Him, lest if now you continue unbelieving, you be convinced hereafter,
when you are tormented with eternal punishments; which punishments, when they had been foretold by the prophets, the later-born poets and philosophers stole from the holy Scriptures, to make their doctrines worthy of credit. Yet these also have spoken beforehand of the punishments that are to light upon the profane and unbelieving, in order that none be left without a witness, or be able to say, "We have not heard, neither have we known." But do you also, if you please, give reverential attention to the prophetic Scriptures,21 and they will make your way plainer for escaping
the eternal punishments, and obtaining the eternal prizes of God. For He who gave the mouth for speech, and formed the ear to hear, and made the eye to see, will examine all things, and will judge righteous judgment, rendering merited awards to each. To those who by patient continuance in well-doing22 seek immortality, He will give life everlasting, joy, peace, rest, and abundance of good things, which neither hath eye seen, nor ear heard, nor hath it entered into the heart of man to conceive.23 But to the unbelieving and despisers, who obey not the truth, but are obedient to unrighteousness, when they shall have been filled with adulteries and fornications, and filthiness, and covetousness, and unlawful idolatries, there shall be anger and wrath, tribulation and anguish,24
and at the last everlasting fire shall possess such men. Since you said, "Show me thy God," this is my God, and I counsel you to fear Him and to trust Him.
http://www.ccel.org/fathers2/ANF-02/TOC.htm
St. John Chrysostom Homily IX. [347-407]
1 Corinthians chapter 3, verse 12-15 If any man build upon this foundation gold, silver, costly stones, wood, hay, stubble; each man's work shall be made manifest: for the day shall declare it, because it is revealed in fire; and the fire shall prove each man's work of what sort it is. If any man's work abide which he built thereon, he shall receive a reward. If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as through fire.
This is no small subject of enquiry which we propose, but rather about things which are of the first necessity and which all men enquire about; namely,
whether hell fire have any end. For that it hath no end Christ indeed declared when he said, "Their fire shall not be quenched, and their worm shall not die. [Mark chapter 8, verse 44 and Mark chapter 8, verse 46 and Mark chapter 8, verse 48]
As I said then; that it hath no end, Christ has declared. Paul also saith, in pointing out the eternity of the punishment, that the sinners "shall pay the penalty of destruction, and that for ever" (2 Thessalonians chapter 1, verse 9) And again, (1 Corinthians chapter 6, verse 9) "
Be not deceived; neither fornicators. nor adulterers, nor effeminate, shall inherit the the kingdom of God." And also unto the Hebrews he saith, (Hebrews chapter 12, verse 14) "
Follow peace with all men, and the sanctification without which no man shall see the Lord." And Christ also, to those who said, "In thy Name we have done many wonderful works," saith, "
Depart from Me, I know you not, ye workers of iniquity" (St. Matthew chapter 7, verse 22) And the virgins too who were shut out, entered in no more. And also about those who gave Him no food, He saith, (St. Matthew chapter 25, verse 46) "
They shall go away into everlasting punishment."
http://www.ccel.org/fathers2/NPNF1-12/npnf1-12-14.htm