مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 347
Purification
How to act when relieving oneself - Section 2
وَعَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " إِنَّمَا أَنَا لَكُمْ مِثْلُ الْوَالِدِ لِوَلَدِهِ أُعَلِّمُكُمْ إِذَا أَتَيْتُمُ الْغَائِطَ فَلَا تَسْتَقْبِلُوا الْقِبْلَةَ وَلَا تَسْتَدْبِرُوهَا وَأَمَرَ بِثَلَاثَةِ أَحْجَارٍ وَنَهَى عَنِ الرَّوْثِ وَالرِّمَّةِ وَنَهَى أَنْ يَسْتَطِيبَ الرَّجُلُ بِيَمِينِهِ. رَوَاهُ ابْنُ مَاجَهْ وَالدَّارِمِيُّ
Abu Huraira reported God’s messenger as saying, "I am to you just like a father to his son, for I give you instruction. When you go to relieve yourselves do not face or turn your back to the qibla.” He commanded that three stones be used, he forbade the use of dung and decayed bones, and he forbade that a man should cleanse himself with his right hand. Ibn Majah and Darimi transmitted it.
Mishkat al-Masabih, 347حسن (الألباني)