Messenger of Allah 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."  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَتَى أَحَدُكُمُ الْغَائِطَ فَلاَ يَسْتَقْبِلِ الْقِبْلَةَ وَلاَ يُوَلِّهَا ظَهْرَهُ شَرِّقُوا أَوْ غَرِّبُوا