Chapter on Etiquettes of Causes Requiring Purification
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 3
وَ بِهَذَا اَلْإِسْنَادِ عَنْ بَعْضِ أَصْحَابِنَا رَفَعَهُ إِلَى أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ:« جَرَتِ اَلسُّنَّةُ فِي اَلاِسْتِنْجَاءِ بِثَلاَثَةِ أَحْجَارٍ أَبْكَارٍ وَ يُتْبَعَ بِالْمَاءِ».
And through this chain of narration, from some of our companions, who raised it to Abu Abdullah عليه السلام, who said:
Imam عليه السلام said: 'It is the established practice in istinja (cleansing) to use three fresh stones, followed by water.'
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 49
- Ṣaḥīḥ al-Tahdhīb