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)
قَالُوا لِسَلْمَانَ قَدْ عَلَّمَكُمْ نَبِيُّكُمْ ﷺ كُلَّ شَيْءٍ قَالَ «أَجَلْ قَدْ نَهَى رَسُولُ اللهِ ﷺ أَنْ نَسْتَقْبِلَ الْقِبْلَةَ بغائطٍ أَوْ بَوْلٍ وَأَنْ يَسْتَنْجِيَ أَحَدُنَا بِالْيَمِينِ أَوْ أَنْ يَسْتَنْجِيَ أَحَدُنَا بِأَقَلَّ مِنْ ثَلَاثَةِ أَحْجَارٍ وَأَنْ يَسْتَنْجِيَ بِرَجِيعٍ أَوْ عَظْمٍ»