1. The Unbelievers or Disbelievers.
“But those who disbelieve and deny Our signs will be companions of the Fire; they will abide therein.” (Al-Baqarah, 2:39).
“Those who have disbelieved and died while they are disbelievers will have the curse of Allah upon them and the [curse of the] angels and all of mankind. [They will abide] eternally therein. The punishment will not be lightened for them, nor will the punishment be postponed.” (Al-Baqarah, 2:161-162).
2. The Hypocrites.
“Indeed the hypocrites will be in the lowest depths of the Fire; you will find no helper for them.” (An-Nisa, 4:145)
“The hypocrites are afraid that a surah be sent down about them, showing them what is [really] in their hearts. Say, ‘Ridicule you! But verily, Allah will expose all that you fear.’ If you question them, they declare, ‘We were only talking idly and playing.’ Say, ‘Is it Allah and His signs and His messengers that you were mocking?’ Make no excuses that you were rejected faith after having accepted it. IF We pardon some of you, We will punish others because they were criminals. The hypocrites – men and women are of one another. They enjoin evil and forbid what is just and close their hands [in stinginess]. They have forgotten Allah, so He has forgotten them. Verily, the hypocrites are rebellious and perverse. Allah has promised the hypocrites men and women and the rejecters of faith the fire of Hell; they will dwell therein. It is sufficient for them. And Allah will curse them, and they will have an enduring punishment.” (At-Tawbah, 9:64-68).
3. The Polytheists Who Associate Allah With Others.
“Those who reject [truth] among the People of the Book and the polytheists were not going to depart [from their ways] until there comes to them clear evidence – a messenger from Allah, rehearsing pure scriptures, wherein are upright laws [or decrees]. Nor did those who had been given the scripture make schisms until after there had come to them clear evidence. And they were not commanded except to worship Allah, sincere in religion to Him, to establish regular prayer, and to pay Zakah. And that is the upright religion. Those who reject [truth] among the People of the Book and the polytheists will be in the fire of Hell, dwelling therein forever. They are the worst of creatures.” (Al-Bayyinah, 98:1-6)
4. People Of The Book Who Reject Islam.
“Those reject [the truth] among the People of the Book are the polytheists will be in the fire of Hell, dwelling there therein forever. They are the worst of creatures.” (Al-Bayyinah, 98:6).
5. Arrogant Rejecters Of The Truth.
“But those who reject Our signs and treat them with arrogance – they are the companions of the Fire, dwelling therein forever.” (Al-A’raf, 7:36)
6. Sinners And Criminals.
“Indeed the criminals will be in the punishment of Hell, dwelling therein forever. It will not be lightened for them, and they will be overwhelmed there in despair. And We have not wronged them, but it is they who have wronged [themselves].” (Az-Zukhruf, 43:74-76).
7. The Unjust.
“Then it will be said to those who were unjust, ‘Taste the eternal punishment. Are you recompensed except for what you used to earn?’” (Yunus, 10:52)
8. The Transgressors.
“But when there comes the Greatest Event – the Day when man will remember what he strove for and the Hellfire will be brought forth for [all] to see – then for him who had transgressed and preferred the life of this world, indeed Hellfire will be his shelter.” (An-Nazi ‘at, 79:34-39).
9. Concealers Of Allah’s Revelations.
“Those who conceal what We have sent down of proofs and guidance after We have made it clear to the people in the scripture- those are cursed by Allah and cursed by those who [are entitled to] curse.” (Surah al Baqarah 2:159) .
Those who curse” refers to the angels and believers.
10. The Tyrants.
“But they asked victory, and disappointment is the lot of every obstinate tyrant. In front of him is Hell, and he is given pus to drink. He will gulp it but will hardly be able t swallow it, and death will come to him from every place, yet he will not die. And in front of him will be a heavy punishment.” (Ibrahim 14:15-17).
“[It will be said to the two angels], ‘Throw into Hellfire every obstinate rejecter [of Allah] – who prevented good, transgressed, and doubted, who set up another god besides Allah – throw him into the severe punishment.’” (Qaf, 50:24-26).
11. The Murderers.
“And whoever kills a believer intentionally – his recompense is Hell to abide therein forever and the wrath and the curse of Allah are upon him, and He has prepared for him a great punishment.” (An-Nisa, 4:93).
12. Persecutors of The Believers.
"Those who presect [or draw into temptations] the believers – men and women – and then do not turn in repentance will have the punishment of Hell, and they will have the punishment of the Burning Fire." (Al-Buruj, b 85:10).
13. Those Who Prefer This World And Neglect The Hereafter.
“Whoever wishes for the immediate – We hasten to grant him such things as We will to whom We will. Then We have mark for them hallmark they will burn therein, disgraced and rejected.” (Al-Isra, 17:18).
14. Those Who Commit Suicide.
Abu Hurairah RA that the Messenger of Allah SAW said: ‘He who kills himself with a steel [weapon] will be eternal inhabitant of Hell, and he will have that [weapon] in his hand and will be thrusting it into his stomach forever and ever; he who kills himself by drinking poison will sip in the fire of Hell, forever and forever. He will kill himself by throwing himself from a top of a mountain and will constantly fall in the fire of Hell forever and ever.” (Muslim).
15. Other Inhabitants.
Harithah bin Wahab narrated RA that he heard the Messenger of Allah SAW say: “Shall I not inform you who the people of Paradise are? [They are comprised of] every person who is weak and taken advantage of, but if he swore that Allah would do something, Allah SWT would comply. And shall I not inform you who the people of Hell are? [They are comprised of] everyone who is cruel, proud and arrogant.” (Muslim and Bukhari).
It was narrated that the Prophet SAW said, "The inhabitants of Hell are five: 1. The weak who lack self-restraint, who follow blindly and do not care for family or property (i.e. they care neither for the benefits of the Hereafter nor of this world); 2. The treacherous that does not show himself but his greed is such that he is deceitful even in small things; 3. A person who would betray you morning and evening regarding your family and your property; 4.The miser of the liar; and 5. One who is in the habit of abusing people and using obscene and foul language." (Muslim).
It was narrated that the Messenger of Allah SAW said: “Paradise and Hell fell into a dispute for, accommodating the haughty and proud, and Paradise said, ‘What is the matter with me that only the meek and the humble and the downtrodden and simple will find abode in me?’ Thereupon, Allah said to Paradise, ‘You are a means of my mercy. I will show mercy through you to whom I will from among My servants.’ Then He said to Hell, ‘You are a sign of My chastisement, and I will chastise through you whom I will from among My servants. Both of you will be full.’ And as regards to Hell, it will not be full until Allah, the Exalted and Glorious, places His foot over it. Then Hell will say, ‘Enough, enough, enough!’ at which point it will be full and will be compressed. Allah will not treat unjustly anyone among His creation. As for Paradise, He will create another creation to fill it.” (Muslim).
Abu Hurairah RA narrated that the Messenger of Allah SAW said: “There are two types of inhabitants of Hell whom I have not seen in my lifetime: People who have whips like the tails of oxen with them and will be beating people, and women who will be dressed yet undressed, who will be inclined to evil and will make others incline towards it. Their heads will appear like the humps of Persian camels inclined to one side. They will not enter Paradise, nor will they even smell its odor, although will be smelled from long distances away.” (Muslim).
When the Prophet Muhammad saw the Hell, many different kinds of people were there; however, there were two types whom he did not recognize because they did not exist at the time when he was alive, (7th century). These two types of people are the following: Firstly, those carry whips that were beating others (oppressors) and secondly, women wearing revealing outfit much like the fashionable clothing of today. These women have unusual hairstyles, perhaps like the ones worn by modern-day women. Through this hadith, the Prophet SAW predicted the nature of women’s clothing in the future - he foretold that clothing considered fashionable would reveal much of the body – and he also predicted the nature of the hairstyles and wigs of modern times worn by those women who will be among the inhabitants of Hell.