It was said to Salman: Your Prophet teaches you everything, even about excrement. He replied: Yes. He has forbidden us to face the qiblah at the time of easing or urinating, and cleansing with right hand, and cleansing with less than three stones, or cleansing with dung or bone.  

قِيلَ لَهُ لَقَدْ عَلَّمَكُمْ نَبِيُّكُمْ كُلَّ شَىْءٍ حَتَّى الْخِرَاءَةَ قَالَ أَجَلْ لَقَدْ نَهَانَا ﷺ أَنْ نَسْتَقْبِلَ الْقِبْلَةَ بِغَائِطٍ أَوْ بَوْلٍ وَأَنْ لاَ نَسْتَنْجِيَ بِالْيَمِينِ وَأَنْ لاَ يَسْتَنْجِيَ أَحَدُنَا بِأَقَلَّ مِنْ ثَلاَثَةِ أَحْجَارٍ أَوْ يَسْتَنْجِيَ بِرَجِيعٍ أَوْ عَظْمٍ  

The Apostle of Allaah ( sal Allaahu alayhi wa sallam ) as saying: I am like father to you. When any of you goes to privy, he should not face or turn his back towards the qiblah. He should not cleanse with his right hand. He (the Prophet, sal Allaahu alayhi wa sallam) also commanded the Muslims to use three stones and forbade them to use dung or decayed bone.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّمَا أَنَا لَكُمْ بِمَنْزِلَةِ الْوَالِدِ أُعَلِّمُكُمْ فَإِذَا أَتَى أَحَدُكُمُ الْغَائِطَ فَلاَ يَسْتَقْبِلِ الْقِبْلَةَ وَلاَ يَسْتَدْبِرْهَا وَلاَ يَسْتَطِبْ بِيَمِينِهِ وَكَانَ يَأْمُرُ بِثَلاَثَةِ أَحْجَارٍ وَيَنْهَى عَنِ الرَّوْثِ وَالرِّمَّةِ  

That he (the Holy Prophet, sal Allahu alayhi wa sallam) said:"When you go to the privy, neither turn your face nor your back towards the qiblah at the time of excretion or urination, but turn towards the east or the west. (Abu Ayyub said): When we came to Syria, we found that the toilets already built there were facing the qiblah, We turned our faces away from them and begged pardon of Allaah.  

إِذَا أَتَيْتُمُ الْغَائِطَ فَلاَ تَسْتَقْبِلُوا الْقِبْلَةَ بِغَائِطٍ وَلاَ بَوْلٍ وَلَكِنْ شَرِّقُوا أَوْ غَرِّبُوا فَقَدِمْنَا الشَّامَ فَوَجَدْنَا مَرَاحِيضَ قَدْ بُنِيَتْ قِبَلَ الْقِبْلَةِ فَكُنَّا نَنْحَرِفُ عَنْهَا وَنَسْتَغْفِرُ اللَّهَ  

The Messenger of Allah ﷺ has forbidden us to face the two qiblahs at the time of urination or excretion.  

نَهَى رَسُولُ اللَّهِ ﷺ أَنْ نَسْتَقْبِلَ الْقِبْلَتَيْنِ بِبَوْلٍ أَوْ غَائِطٍ  

I saw Ibn Umar make his camel kneel down facing the qiblah, then he sat down urinating in its direction. So I said: AbuAbdurRahman, has this not been forbidden? He replied: Why not, that was forbidden only in open country; but when there is something between you and the qiblah that conceals you , then there is no harm.  

عَنْ ذَلِكَ فِي الْفَضَاءِ فَإِذَا كَانَ بَيْنَكَ وَبَيْنَ الْقِبْلَةِ شَىْءٌ يَسْتُرُكَ فَلاَ بَأْسَ