What will happen to the living people on the Doomsday?
Everybody will die with the strike of Doomsday.
It means standing up, standing, rising up, straightening up and resurrecting. In the belief of Islam, it denotes the disturbance of the system of the universe, everything being upside down and all of the dead resurrecting and standing. In the Quran, that event is mentioned with various names.
Among those names are Yawmul-Qiyamah (Day of Standing), as-Saa (Hour), Yawmul-Âkhir (Last day), al-Âkhira (Future Life), Yawmud-Din (Day of Punishment), Yawmul-Hisab (Day of Reckoning), Yawmul-Fasl (Day of Decision), Yawmul-Jam (Day of Coming Together), Yawmul-Khulud( Day of Eternity, Being Eternal), Yawmul-Ba’th (Day of Resurrection), Yawmul-Hashra (day of Repentance), Yawmut-Taghabun (Day of Mutual disillusion), al-Qaria (Astonishing Calamity), an-Nashiya (Terrifying Disaster), at-Tamma (Calamity Surrounding Everything), al-Haqqa (Great Truth) and al-Waqia (Great Event)'. Those names reveal and explain the formation and outcomes of Doomsday.
Doomsday forms the first phase of the life in the hereafter, the second fundamental belief of Islam that comes after belief in Allah. Events like Gathering, Reckoning, Scales, Paradise and Hell that will take place with a general destruction and resurrection are all in the agenda of Doomsday. Therefore, belief in the hereafter is nothing but belief in Doomsday and the events that take place together with it. Due to its great importance, the Quran often reminds us Doomsday; sometimes the Quran uses it as an element of frightening and warning. And the Hour is surely coming (when this will be manifest) (al-Hijr, 15/85), there can be no doubt about it (al-Hajj, 22, 7). Already have come some tokens thereof (Muhammad, 47/18), the hour (of Judgment) is nigh (al-Qamar, 54/1). And the matter of the Hour (of Judgment) is as the twinkling of an eye, or even quicker (an-, Nahl, 16, 77). Those who reject Faith will not cease to be in doubt concerning (Revelation) (al-Hajj 22/55), they deny the Hour (al-Furqan 25/11). Heavy were its burden through the heavens and the earth. Only, all of a sudden will it come to you (al-A'raf, 7/187). The convulsion of the Hour (of Judgment) will be a thing terrible (al-Hajj, 22/1). And that Hour will be Most grievous and most bitter. (al-Qamar, 54/46). We have prepared a Blazing Fire for such as deny the Hour (al-Furqan, 25/11).
Although the Quran informs us about the certainty and closeness of Doomsday and even gives descriptions about how it will take place, it does not make any explanations about its time. Doomsday is an event that is completely based on the will of Allah and no one except Him knows about it. After stating that the time of Doomsday cannot be known by anybody with verses like, “Verily the knowledge of the Hour is with Allah (alone)." (Luqman, 31/34), the Quran answers the questions about it as follows: " The knowledge thereof is with my Lord (alone): none but He can reveal as to when it will occur" (al-A'raf, 7/187). They ask thee about the Hour― `When will be its appointed time?' Wherein art thou (concerned) with the declaration thereof? With they Lord is the Limit fixed therefore “(an-Naziat, 79/42-44). In the hadith that is known as the hadith of Jibril (Gabriel), Hazrat Prophet answers the question of Jibril about the issue as “The answerer has no better knowledge than the questioner." Stating that he has no knowledge about the time of Doomsday."(Bukhari, Eeman, 37).
The Quran draws detailed and terrifying paintings about the formation of Doomsday. According to these verses, "Doomsday will start when the Trumpet will be sounded" (az-Zumar, 39/68) and every mother giving suck shall forget her suckling-babe, and every pregnant female shall drop her load (unformed), people will be like drunk due to the terrifying sound and the convulsion (al-Hajj, 22/1-2). The Day that the sky will be like molten brass, And the mountains will be like wool, And no friend will ask after a friend (al-Maarij, 70/8-10). When the Sky is cleft asunder; When the Stars are scattered; When the Oceans are suffered to burst forth; And when the Graves are turned upside down (al-İnfitar, 82/1-5). At length, when the Sight is dazed, And the moon is buried in darkness. And the sun and moon are joined together― That Day will Man say "Where is the refuge?" (al-Qiyamah, 75/6-12). When the sun (with its spacious light) is folded up; When the stars fall, losing their luster; When the mountains vanish (like a mirage); When the she-camels, ten months with young, are left untended; When the wild beasts are herded together (in human habitations); When the oceans boil over with a swell; When the souls are sorted out, (being joined, like with like); When the female (infant) buried alive , is questioned― For what crime she was killed; When the Scrolls are laid open; When the World on High is unveiled: When the Blazing Fire is kindled to fierce heat; And when the Garden is brought near― (at-Takwir, 81/1-13).
That first phase of Doomsday, in which the general destruction takes place, will be followed by the second phase, in which the trumpet will be sounded; all people will stand up (az-Zumar, 39/68). The resurrection and standing up will be followed by gathering. The Quran narrates the second phase with lively descriptions: They will come forth― their eyes humbled― from (their) graves, (torpid) like locusts scattered abroad, hastening, with eyes transfixed, towards the Caller!― "Hard is this Day!" the Unbelievers will say (al-Qamar, 54/7-8). One day He will gather them together (Yunus 10/45). That Day shall a man flee from his own brother. And from his mother and his father. And from his wife and his children. Each one of them, that Day, will have enough concern (of his own) to make him indifferent to the others. Some Faces that Day will be beaming, Laughing, rejoicing. And other faces that Day will be dust-stained; Blackness will cover them: Such will be the Rejecters of Allah, the Doers of Iniquity. (Abasa, 80/34-42). One day We shall call together all human beings with their (respective) Imams (al-İsra, 17/71), and when the messengers are (all) appointed a time (to collect)(al-Mursalat, 77/11), the Day the heaven shall be rent asunder with clouds, and angels shall be sent down descending, (in ranks) (al-Furqan, 25/25).
After the resurrection, standing up and gathering, people will be given their books of deeds; the scales will be set up; the rewards and sins of people will be weighed; those who deserve Paradise will go there; those who deserve Hell will go there to stay temporarily or forever; thus, the endless life of the hereafter will start with happiness or torture.
It has become a tradition among Muslims to call death as small doomsday although it is not based on any certain evidence in the Quran and sunnah. According to some scholars, that definition is based on the fact that death is a passage for the life in the hereafter. Some scholars say that definition is based on the Quran. According to those scholars, the word ‘hour’ meaning ‘ Doomsday’ in the following verse also denotes death "Lost indeed are they who treat it as a falsehood that they must meet Allah,― until on a sudden the hour is on them, and they say: "Ah! woe unto us that we took no thought of it"; for they bear their burdens on their backs; and evil indeed are the burdens that they bear!..." (al-An'am, 6/31).
The period that starts with small doomsday (death) and lasts till big Doomsday is called the Life of Grave or Barzakh. In the Life of Grave, there is the questioning by the angels, munkar and nakir, and happiness or torture depending on whether the dead person is a believer or unbeliever. In a hadith related to the Life of Grave, Hazrat Prophet (pbuh) defined grave as a garden from the gardens of Paradise or a pit from the pits of Hell. (Tirmidhi, Qiyamah, 26). In another hadith, it is narrated that the dead person is given bounties or tortured after the questioning by munkar and nakir. Accordingly, the grave of the believer is expanded seventy arshins (1 arshin = 68 cm) and it is enlightened; the following is said to him, "Go on sleeping until the Day of Gathering like a person who has entered the bridal chamber and is awakened by the person whom he loves the most." The grave of the munafiq (hypocrite) is ordered to squeeze him. The earth squeezes him like a press until his bones are broken into pieces and that dead person is tortured until he is resurrected (Tirmidhi, Janaiz; 70).