As for belief in the Last Day, it includes belief in all that Allah and His Messenger (Peace and Blessings of Allah be upon him) have told us about what will happen after death.
Such as the trial of the grave, and its punishment and bliss; what will happen on the Day of Resurrection such as its horrors and hardships.
The Bridge, the Balance, the Reckoning, the Recompense and spreading of the Records of deeds in front of all of mankind. Some will receive their record with their right hands and some will receive theirs with their left hands or from their backs.
Belief in the Hereafter also entails belief in the Prophet’s Lake-Fount. Belief in Paradise and Hell and belief that the believers will see their Lord and that He will speak to them among other things that are mentioned in the Qur’an.
In the authentic sayings of the Prophet (Peace and Blessings of Allah be upon him). All that must be believed in and accepted as explained by Allah and His Messenger (Peace and Blessings of Allah be upon him).
The following are the detailed proof of that in light of the Qur’anic verses and authentic Hadiths.
All the verses about day of judgement in quran have been mentioned here in this post.
One: The Grave and the Barzakh Life
Two: Blowing of the Trumpet
Three: Horrors of the Day of Resurrection
First of all we will start with the meaning of Barzak.
Meaning: Barzakh, linguistically means a barrier between two things.
وَجَعَلَ بَيْنَهُمَا بَرْزَخًا وَ
“And He has set (Barzakh) a barrier between them.”
Al-Furqan 25 :53
In the Shari’ah, Barzakh is a life that starts immediately after death and ends at Resurrection.
Every person who dies -regardless of his being a believer or disbeliever automatically enters into this life.
In Barzakh life, the dead person undergoes punishment or enjoys bliss (according to his or her deeds), souls of the believers are introduced to Paradise and souls of the disbelievers are introduced to Hell.
Ibn Al-Qayyim (May Allah have mercy upon him) said,
“Punishment and bliss of the grave is another name for punishment and bliss of the Barzakh -it is a transitional life between this world and the Hereafter.
Prohibition of Wishing and Supplicating for Death
Anas bin Malik (May Allah be pleased with him) narrated that the Messenger of Allah (Peace and Blessings of Allah be upon him) said;
“Let none amongst you wish for death because of a hardship that afflicted him. If, at all, he has a reason to do so, let him say:
‘O Allah! Keep me alive as long as my remaining alive is better for me; and make me die as long as my being dead is better for me.”
Recorded by Muslim
Some scholars say;
“Death is not a complete inexistence or disappearance. Rather, it is separation of the soul from the body, change of situation and movement from one abode to another. Death is one of the greatest calamities.
Allah calls it so when He says,
ۚفَأَصَابَتْكُمْ مُصِيبَةُ الْمَوْتِ
“And death befalls on you.”
It is, indeed, a great calamity, but according to the scholars, it is a greater calamity to be forgetful about it, to turn away whenever it is mentioned, and to not think of it or work towards it.
Death alone is enough an admonition for someone who wants to learn.
It is enough a thought for a person who wants to think. (he only situation in which a person can wish for death is when one fears that he may lose his religion, and at the appearance of turmoil.
Also read: Where do souls stay during the Barzakh Life