Hadith related to grave (Qabar)
Sahi Bokhari (sahih bukhari)
The Prophet 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 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 Quran).’ 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.”
Narrated Ibn Abbas:
The Prophet 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, “O Allah’s Apostle! Why have you done so?” He replied, “I hope that their punishment may be lessened till they (the leaf) become dry.”
Narrated Anas bin Malik:
Allah’s Apostle 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 Quran).” 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. (See Hadith No. 422).