مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 336
Purification
How to act when relieving oneself - Section 1
وَعَن سلمَان قَالَ: نَهَانَا يَعْنِي رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ نَسْتَقْبِلَ الْقِبْلَةَ لِغَائِطٍ أَوْ بَوْل أَو أَن نستنتجي بِالْيَمِينِ أَوْ أَنْ نَسْتَنْجِيَ بِأَقَلَّ مِنْ ثَلَاثَةِ أَحْجَارٍ أَوْ أَنْ نَسْتَنْجِيَ بِرَجِيعٍ أَوْ بِعَظْمٍ. رَوَاهُ مُسلم
Salman said, “He (meaning God’s messenger) forbade us to face the qibla when easing ourselves or passing water, or to wipe ourselves with the right hand, or to wipe ourselves with less than three stones, or to wipe ourselves with dung or bone.” Muslim transmitted it.
Mishkat al-Masabih, 336صَحِيح (الألباني)