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Bulugh al-Maramوَلِلْحَاكِمِ: { أَكْثَرُ عَذَابِ اَلْقَبْرِ مِنْ اَلْبَوْلِ } وَهُوَ صَحِيحُ اَلْإِسْنَاد ِ (123) .
and Al-Hakim reported that:
"Urination is the main cause of punishment in the grave" . [Its chain of narrators is authentic].
Reference: Bulugh al-Maram 104
In-book : Book 1, Hadith 123
English translation : Book 1, Hadith 110
In-book : Book 1, Hadith 123
English translation : Book 1, Hadith 110