(7) باب قضاء الحاجة
and its Asl (original source) is in Abu Da'ud and At-Tirmidhi and Ibn Khuzaima graded it Sahih (sound) through Abu Huraira (rad) without mentioning the "stones".] (DE)
Reference (DE): Bulugh al-Maram 108 (DE)
In-book reference (DE): Book 1, Hadith 127 (DE)
English translation (DE): Book 1, Hadith 114 (DE)