Sunan Ibn Majah, Book 1, Hadith 355 (In-Book) ⓘ
It was narrated that Mugirah bin Shu'bah said: "Whenever the Prophet went to relieve himself, he would go far away."
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ، عَنْ مُحَمَّدِ بْنِ عَمْرٍو، عَنْ أَبِي سَلَمَةَ، عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ، قَالَ كَانَ النَّبِيُّ ـ صلى الله عليه وسلم ـ إِذَا ذَهَبَ الْمَذْهَبَ أَبْعَدَ .
also referenced under: Hadith 331 (Reference) & Volume 1, Book 1, Hadith 331 (DarusSalam)