Sahih Al Bukhari (216)

حَدَّثَنَا عُثْمَانُ، قَالَ: حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ: مَرَّ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ بِحَائِطٍ مِنْ حِيطَانِ المَدِينَةِ، أَوْ مَكَّةَ، فَسَمِعَ صَوْتَ إِنْسَانَيْنِ يُعَذَّبَانِ فِي قُبُورِهِمَا، فَقَالَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: "يُعَذَّبَانِ، وَمَا يُعَذَّبَانِ فِي كَبِيرٍ" ثُمَّ قَالَ: "بَلَى، كَانَ أَحَدُهُمَا لاَ يَسْتَتِرُ مِنْ بَوْلِهِ، وَكَانَ الآخَرُ يَمْشِي بِالنَّمِيمَةِ". ثُمَّ دَعَا بِجَرِيدَةٍ، فَكَسَرَهَا كِسْرَتَيْنِ، فَوَضَعَ عَلَى كُلِّ قَبْرٍ مِنْهُمَا كِسْرَةً، فَقِيلَ لَهُ: يَا رَسُولَ اللَّهِ، لِمَ فَعَلْتَ هَذَا؟ قَالَ: "لَعَلَّهُ أَنْ يُخَفَّفَ عَنْهُمَا مَا لَمْ تَيْبَسَا" أَوْ: "إِلَى أَنْ يَيْبَسَا"

Ibn `Abbas (may Allah be pleased with him) narrated: Once the Prophet (peace be upon him), while passing through one of the graveyards of Medina or Makkah heard the voices of two persons who were being tortured in their graves. The Prophet (peace be upon him) said, “These two persons are being tortured not for a major sin (to avoid).” The Prophet (peace be upon him) then added, “Yes! (they are being tortured for a major sin). Indeed, one of them never saved himself from being soiled with his urine while the other used to go about with calumnies (to make enmity between friends). The Prophet (peace be upon him) then asked for a green leaf of a date-palm tree, broke it into two pieces and put one on each grave. On being asked why he had done so, he replied: “I hope that their torture might be lessened, till these get dried.”