BELIEF IN THE LAST DAY
The Last Day is the Day when mankind will be resurrected to be asked about their deeds and receive reward or punishment for them. It is called the Last Day,because it is the last day, no day after that. Afterwards, people of Paradise will permanently reside and take their places in it, and people of Hell will permanently reside and take their places in it. 
Belief in the Last Day is firmly believing that everything that Allah has told us about in His Book (Al-Quran) and that His Messengerﷺhas told us about what will happen after death, will indeed happen and come to pass. That includes believing in the signs of the Hour which will happen before the Last Day; in death and things that accompany it when a person is on his deathbed; what comes after death, namely the trial of the grave and torment or blessing therein; the Trumpet and resurrection; the standing and terrors of the Day of Resurrection; the details of the gathering and reckoning; Paradise and its delights, the greatest of which will be looking upon the Face of Allah; Hell and its torments, the most severe of which will be their being veiled from seeing their Lord. And belief in the Last Day includes acting in accordance with what is implied by these beliefs, A'laam al-Sunnah al-Manshoorah, 110; Sharh al-Usool al-Thalaathah by Shaykh Ibn 'Uthaymeen, 98-103. 
One must believe that the life of this world will come to an end. Allah says: "Whatsoever is on it (the earth) will perish." (Quran Surah 55:26) When Allah wills this world to come to an end, Allah will order Angel Israafeel to blow the Trumpet. At that point, everything on Earth will perish. Then He will order him to blow it again, and upon that, all people will rise from their graves in their bodies, all over the world, from the time of Adam («may god exalt their mention»). Allah says: "And the Trumpet will be blown, and all who are in the heavens and all who are on the earth will collapse and die, except him whom Allah wills. Then it will be blown a second time and behold, they will be standing, looking on (waiting)." (Quran Surah 39:68)
The Resurrection happens when the Horn will be blown for the second time. Afterwards, mankind will be resurrected to face the questioning by the Lord of the worlds. Allah said, what translated means, As We began the first creation, We shall repeat it, (it is) a promise binding upon Us. Truly, We shall do it." [Quran Surah21:104]
In the Last Day, the slave will be rewarded or punished for his deeds. This fact was also confirmed by the Quran, the Sunnah and the consensus of Muslims. Allah said, what translated means, Verily, to Us will be their return. Then verily, for Us will be their Reckoning.[Quran Surah 88:25-26], Whoever brings a good deed shall have ten times the like thereof tohis credit, and whoever brings an evil deed shall have only the recompense of the like thereof and they will not be wronged.[Quran Surah6:160] and, And We shall set up balances of justice on the Day of Resurrection, then none will be dealt with unjustly in anything. And if there be the weight of a mustard seed, We will bring it And Sufficient are We as Reckoners.[Quran Surah 21:47].
They are the final destination for whoever deserves either one of them, and for eternity. Paradise is the destination of the ultimate happiness and joy that Allah prepared for the believers who feared Him, believed in what He required from them to believe and obeyed Him and His Messenger. They are the ones who were sincere to Allah and followers of His Messenger. Paradise contains, of Allahs bounties, What no eye has ever violated, what no ear has ever heard of and what no mind has ever imagined (of joys that Allah hid for the believers).
Allah said, what translated means, Verily, those who believe (in Allah) and do righteous, good deeds, they are the best of creatures. Their reward with their Lord is Gardens of Eternity, underneath which rivers flow, they will abide therein forever, Allah Well-Pleased with them, and they with Him. That is for him who fears his Lord.[Quran Surah98:7-8] and, No person knows what is kept hidden for them of joy as a reward for what they used to do.) [Quran Surah 32:17].
Belief in the Last Day constitutes, belief in everything Allah and His Messenger, may Allah exalt his mention, has informed us about:
This life is the time after one’s death until the Last Day. In it, the believer will live a life of pleasure, while the disbelievers will be punished. Allah says: "The Fire; they are exposed to it, morning and afternoon, and on the Day when the Hour will be established (it will be said to the angels): ‘Make Fir‘awn’s (Pharaoh) people enter the severest torment!" (Quran Surah 40:46)
Allah will resurrect mankind, naked, barefooted, and uncircumcised. Allah says: "The disbelievers pretend that they will never be resurrected (for the Account). Say: Yes! By my Lord, you will certainly be resurrected, then you will be informed of (and recompensed for) what you did, and that is easy for Allah." (Quran Surah 64:7)
Allah will gather all creation together and call them to account. Allah says: "And (remember) the Day We shall cause the mountains to pass away (like clouds of dust), and you will see the earth as a leveled plain, and we shall gather them all together so as to leave not one of them behind." (Quran Surah 18:47)
Allah says: "And they shall be brought before your Lord, standing in ranks: Now certainly you have come to Us as We created you at first. Nay, you thought that We had not appointed to you a time of the fulfillment of the promise." (Quran Surah 18:48)
Allah says: "Till, when they reach it (Hellfire), their hearing (ears) and their eyes, and their skins will testify against them as to what they used to do. * And they will say to their skins, ‘Why do you testify against us?’ They will say: ‘Allah has caused us to speak, He causes all things to speak: and He created you the first time, and to Him you are made to return.’ * And you have not been hiding yourselves (in the world), lest your ears, and your eyes, and your skins testify against you; but you thought that Allah knew not much of what you were doing." (Quran Surah 41:20-22)
Allah says: "But stop them; verily they are to be questioned. * ‘What is the matter with you? Why do you not help one another [as you used to do in the world]?’ * Nay, but that Day they shall surrender." (Quran Surah 33:40)
Allah says: "There is not one of you but will pass over it (Hell); this is with your Lord a Decree which must be accomplished." (Quran Surah 19:71)
Allah will call people to account and reward those who did well with what they deserve, due to their righteous deeds, their Belief, and adherence to their Messengers, and He will punish those who did evil. Allah says: "And We shall set up balances of justice on the Day of Resurrection, then none will be dealt with unjustly in anything. And if there be the weight of a mustard seed, We will bring it. And Sufficient are We to take account." (Quran Surah 21:47)
Allah says: "Then, as for him who will be given his Record in his right hand, He surely will receive an easy reckoning. * And he will return to his family in joy! * But whosoever is given his Record behind his back. * He will invoke (his) destruction. * And he shall enter a blazing Fire and made to taste its burning." (Quran Surah 84:7-12)
10. To believe that people will be rewarded with Jannah or Hellfire in an everlasting and eternal life.
Allah says: "Verily those who disbelieve from among the people of the Book (Jews and Christians) and the mushrikoon (pagans) will abide in the Fire of Hell. They are the worst of creatures * Verily, those who believe and do righteous deeds, they are the best of creatures. Their reward with their Lord is ‘Adn (Eden) Jannah (Gardens of Eternity), underneath which rivers flow. They will abide therein forever, Allah will be pleased with them, and they with Him. That is for him who fears his Lord." (Quran Surah 98:6-8)
11.To believe in the Hawdh(Kauthar), Intercession, and all other things which the Messenger of Allah informed us.
1.It would make one prepare himself for that Day, by performing good deeds, and competing therein, and abstaining from sinful acts and fearing His punishment.
2.It would comfort the believers; since they know what they missed in this world, Allah would reward them with better in the Hereafter.
3.To distinguish the believers who are truthful in their faith from those who are not.