What I understood from your Urdu sentence is “Only the corpse knows what is going on in grave.”

As Muslims, we believe in the punishment of the grave. There are many narrations which verify its authenticity. The Prophet (peace be upon him) said, “Seek refuge with Allah from the punishment of Hell, and seek refuge in Allah from the punishment of the grave. Seek refuge in Allah from the trial of Al-Masihid-Dajjal, and seek refuge in Allah from the trials of life and death.” (At-Tirmidhi)

According to a report which is related in Al-Bukhari, `Aishah said that a Jewess came to her and mentioned the punishment in the grave, saying to her, “May Allah protect you from the punishment of the grave.” `Aisha then asked Allah’s Messenger (peace be upon him) about the punishment of the grave. He said, “Yes, (there is) punishment in the grave.” `Aisha added, “After that I never saw Allah’s Messenger (peace be upon him) but seeking refuge with Allah from the punishment in the grave in every prayer he prayed.” (Al-Bukhari)

The torment in the grave will vary according to the sins committed by the person in this world, whether he was a disbeliever or a disobedient Muslim. There are authentic narrations which describe this torment for the people who commit these sins.

A righteous believer will receive eternal blessings in his grave. Allah’s Messenger (peace be upon him) said, “When (Allah’s) slave is put in his grave and his companions return and he even hears their footsteps, two angels come to him and make him sit and ask, ‘What did you use to say about this man (i.e. Muhammad)?’ The faithful Believer will say, ‘I testify that he is Allah’s slave and His Apostle.’ Then they will say to him, ‘Look at your place in the Hell Fire; Allah has given you a place in Paradise instead of it.’ So he will see both his places.” (Qatada said, “We were informed that his grave would be made spacious.” Then Qatada went back to the narration of Anas who said;) Whereas a hypocrite or a non-believer will be asked, “What did you use to say about this man.” He will reply, “I do not know; but I used to say what the people used to say.” So they will say to him, “Neither did you know nor did you take the guidance (by reciting the Qur’an).” Then he will be hit with iron hammers once, that he will send such a cry as everything near to him will hear, except Jinns and human beings. (Al-Bukhari)