Al-Hafidh Abu Isa at-Tirmidhee recorded from Abu Hurayrah (radhi allahu anhu)
that the Messenger of Allah (sallallahu alahi wa-sallam) said, 'When the dead or
one of you is buried, two dark and blue angels will come to him; one is called 'Munkar'
and the other is called, 'Nakir.' They will ask him, 'What did you say about
this man (Muhammad)? He will reply, 'What he used to say that he is Allah's
servant and Messenger. I bear witness that there is no true deity except Allah
and that Muhammad is His servant and Messenger.' They will say, 'We know that
you used to say that,' and his grave will be made larger for him to seventy
forearms length by seventy forearms width and will be filled by light for him.
He will be told, 'Sleep,' but he will reply, 'Let me go back to my family in
order that I tell them.' They will say, 'Sleep, just like the bridegroom who is
awakened by the dearest of his family, until Allah resurrects him from that
sleep.' If he was a hypocrite, his answer will be, 'I do not know! I heard
people say something, so I used to repeat what they were saying.' They will say,
'We know that you used to say that.' The earth will be commanded, 'Come closer
all around him,' and it will come closer to him until his ribs cross each other.
He will remain in this torment, until Allah resurrects him from his sleep.'
[Saheeh al-Jamee (no. 724)]