It was narrated from Anas (may Allaah be pleased with him) that the Prophet (peace and blessings of Allaah be upon him) said: “When a person is placed in his grave and his companions leave him, and he can no longer hear the sound of their sandals (footsteps), two angels come to him and make him sit up, and they ask him, ‘What did you say about this man Muhammad (peace and blessings of Allaah be upon him)?’ He says, ‘I bear witness that he is the slave of Allaah and His Messenger.’ It is said, ‘Look at your place in Hell which Allaah has replaced for you with a place in Paradise.’” The Prophet (peace and blessings of Allaah be upon him) said, “And he sees them both. But as for the kaafir or hypocrite, he says, ‘I do not know, I used to say what the people said.’ It is said, ‘You did not know and you did not follow those who knew.’ Then he is struck a blow with an iron hammer between his ears and he screams a scream which everything around him can hear apart from the two races (of mankind and the jinn).”
(Narrated by al-Bukhaari, 1222)