(7) باب قضاء الحاجة
and Al-Hakim reported that:
"Urination is the main cause of punishment in the grave". [Its chain of narrators is authentic]. (IT)
Reference (IT): Bulugh al-Maram 104 (IT)
In-book reference (IT): Book 1, Hadith 123 (IT)
English translation (IT): Book 1, Hadith 110 (IT)