What is the first question asked in the grave.

 The question asked, 

What is the first question asked in the grave. 

Alhamdulillah, in the grave when a person dies, he is asked three questions, 

Who is your Lord? 

What is your religion?

Who is your prophet? 

These are three questions every person will be questioned in the grave 

As reported in hadith, 

Narrated Anas:

The Prophet (ﷺ) said, "When a human being is laid in his grave and his companions return and he even hears their foot steps, two angels come to him and make him sit and ask him: What did you use to say about this man, Muhammad ? He will say: I testify that he is Allah's slave and His Apostle. Then it will be said to him, 'Look at your place in the Hell-Fire. Allah has given you a place in Paradise instead of it.' " The Prophet (ﷺ) added, "The dead person will see both his places. But a non-believer or a hypocrite will say to the angels, 'I do not know, but I used to say what the people used to say! It will be said to him, 'Neither did you know nor did you take the guidance (by reciting the Qur'an).' Then he will be hit with an iron hammer between his two ears, and he will cry and that cry will be heard by whatever approaches him except human beings and jinns."

Sahih al-Bukhari 1338.

So anyone who is about to say the answer correctly will be asked to lie in the grave like a newly wedded night and anyone who could not will be punished and the hammer to strike him will be heavy that no man or jinn can carry it.