A--- There are numerous Hadiths, foremost among which are the following:

Narrated Anas (May Allah be pleased with him): The Prophet (Peace be upon him) says: "When a -human being is laid in his grave and his companions leave (the burying place) and he even hears their foot steps, two angels come to him and make him 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 Messenger. 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 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. "(Bukhari and Muslim)

Narrated Ibn 'Abbas (May Allah be pleased with him): The Prophet (Peace be upon him) once passed by two graves, and those two persons (in the graves) were being tortured. He said: "They are being tortured not for a great thing (to avoid). One of them never saved himself from being soiled with his urine, while the other was going about with calumnies (to make enmity between friends). He then took a green leaf of a date-palm tree split it into two pieces and fixed one on each grave. The people said: "0