Every created being will come to an end. Allah the Exalted said: (What so ever is not it (the Earth) will perish. (The Noble Qur’an 55:26).
Allah the Exalted, sent us His Messengers to prepare ourselves for that Day. A day where every human being since the beginning of creation will stand for reckoning and will be held accountable for everything he or she committed.
Allah the Exalted said: (And be afraid of the Day when you shall be brought back to Allah. Then every person shall be paid what he earned, and they shall not be dealt with unjustly.) (The noble Qur’an 2:281)
Allah, the Exalted, responded to them on many occasions, He said: (And he (man) puts forth for Us a parable, and forgets his own creation. He says: “Who will give life to these bones after they are rotten and have become dust?” (78) Say: (O Muhammad) “He will give life to them Who created them for the first time! And He is the All-Knower of every creation!” (79)) (The Noble Qur’an 36:78-79)
(Is not He, Who created the heavens and the Earth Able to create the like of them? Yes, indeed! He is the All-Knowing Supreme Creator.) (The Noble Qur’an 36:81)
A Muslim should believe in the Hereafter and what will take place on that Day. This is because it was mentioned in the Qur’an and the authentic Sunnah (Prophetic tradition). Whoever denies that is not a believer. Allah praised the believers for believing in the unseen (i.e. Allah His books, Angels, Messengers, the Day After, and Predestination).
Allah the Exalted said: (This is the Book (the Qur’an), whereof there is no doubt, a guidance to those who are Al-Muttaqun [the pious and righteous person](2) Who believe in the Ghaib [the unseen] and perform As-Salat, and spend out of what we have provided for them (3) (The Noble Qur’an 2:2-3)
Allah described those who believe in the unseen as : (They are on (true) guidance from their Lord, and they are successful.) (The Noble Qur’an 2:5)
On that Day, a very terrifying day, the witnesses will be the prophets, angels, scholars, the land, and even our own limbs will testify either for a against us. And the Greatest of all witnesses is Allah the Exalted.
Allah the Exalted said: (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. “) (The Noble Qur’an 41:21)
On that Day the judge will be Allah the All-Wise and the one who is the most just. (Surely! Allah wrongs not even of the weight of an atom (or a small ant), but if there is any good (done), He doubles it, and gives from Him a great reward) (The Noble Qur’an 4:40)
Abu Hurairah narrated that the prophet said, Allah said: (I have prepared for my righteous servants what no eye has seen, no ear has heard and no mind has imagined. The Prophet said: read if you will (No person knows what is kept hidden for them of joy as a reward for what they used to do) (The Noble Qur’an 32:17)) (Al-Bukhari &Muslim)