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