Chapter: While urinating or defecating, never face the Qiblah except when you are screened by a building or a wall or something like that
Abu Aiyub Al-Ansari
Narrated Abu Aiyub Al-Ansari:Allah's Messenger (ﷺ) said, "If anyone of you goes to an open space for answering the call of nature he should neither face nor turn his back towards the Qibla; he should either face the east or the west."
Reference
Sahih al-Bukhari 144
In-book reference
Book 4, Hadith 10
USC-MSA web (English)
Vol. 1, Book 4, Hadith 146
Arabic Text
حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ، قَالَ حَدَّثَنَا الزُّهْرِيُّ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ أَبِي أَيُّوبَ الأَنْصَارِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا أَتَى أَحَدُكُمُ الْغَائِطَ فَلاَ يَسْتَقْبِلِ الْقِبْلَةَ وَلاَ يُوَلِّهَا ظَهْرَهُ، شَرِّقُوا أَوْ غَرِّبُوا ".