(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]. (RU)
Reference (RU): Bulugh al-Maram 104 (RU)
In-book reference (RU): Book 1, Hadith 123 (RU)
English translation (RU): Book 1, Hadith 110 (RU)