A: These great Ayahs warn against Shirk (associating others with Allah in His Divinity or worship), Qatl (murder), and Zina (sexual intercourse outside marriage). Thus, whoever commits all or any of these major sins is threatened by Allah's Saying: and whoever does this shall receive the punishment. The punishment is a valley in Hellfire according to one view or, as another opinion states, a grievous torment which is explained by Allah's Saying: The torment will be doubled to him on the Day of Resurrection, and he will abide therein in disgrace;
At the same time, these three major sins have different degrees. Shirk is the worst crime and the gravest sin. Whoever commits it will abide eternally in Hellfire and will never be brought out of it. The foregoing is explicitly stated by Allah (Exalted be He) in Surah (Qur'anic chapter) A lTawbah: It is not for the Mushrikûn (polytheists, idolaters, pagans, disbelievers in the Oneness of Allâh), to maintain the Mosques of Allâh (i.e. to pray and worship Allâh therein, to look after their cleanliness and their building,), while they witness against their ownselves of disbelief. The works of such are in vain and in Fire shall they abide. And: But if they had joined in worship others with Allâh, all that they used to do would have been of no benefit to them. Allah (Glorified and Exalted be He) also says: And indeed it has been revealed to you (O Muhammad peace be upon him), as it was to those (Allâh's Messengers) before you: "If you join others in worship with Allâh, (then) surely (all) your deeds will be in vain, and you will certainly be among the losers." Moreover, He (Exalted be He) tells about Mushriks (people who associate others with Allah in His Divinity or worship): They will long to get out of the Fire, but never will they get out therefrom; and theirs will be a lasting torment. There are many other Ayahs that indicate the same meaning.
Allah shall bring them out of it just by His Mercy, for having died while believing in Tawhid and having faith in Him. However, they will be punished in Hellfire for their sins and bad deeds and when they are purified, Allah (Exalted be He) will take them out of Hellfire after the expiry of the period that He decreed for them to spend in the Fire. It is only by the Mercy of Allah (Glorified and Exalted be He) that they will sprout like a seed does in the silt carried by a flood and when they are fully recreated, He (Exalted be He) will admit them to Jannah. The foregoing is supported by more than one authentic Hadith Mutawatir (a Hadith reported by a significant number of narrators throughout the chain of narration, whose agreement upon a lie is impossible) from the Messenger of Allah (peace be upon him).
Thus, it is clear that a sinner, such as a murderer or an adulterer, will not abide in Hellfire in the same manner as Kafirs (disbelievers) will, but only for a specific period of time that comes to an end, for Allah (Glorified and Exalted be He) says: and he will abide therein in disgrace This is only a temporary stay that differs from that of the Mushriks. The same applies to the threat which is given to whoever commits suicide. May Allah protect us.