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. (Using translation from Abū Dāʾūd 7)
قِيلَ لَهُ قَدْ عَلَّمَكُمْ نَبِيُّكُمْ ﷺ كُلَّ شَيْءٍ حَتَّى الْخِرَاءَةَ؟ قَالَ فَقَالَ أَجَلْ لَقَدْ نَهَانَا أَنْ نَسْتَقْبِلَ الْقِبْلَةَ لِغَائِطٍ أَوْ بَوْلٍ أَوْ أَنْ نَسْتَنْجِيَ بِالْيَمِينِ أَوْ أَنْ نَسْتَنْجِيَ بِأَقَلَّ مِنْ ثَلَاثَةِ أَحْجَارٍ أَوْ أَنْ نَسْتَنْجِيَ بِرَجِيعٍ أَوْ بِعَظْمٍ