كتاب الطهارة
1  
The Book of Purification
(39)
Chapter: Allowing The Usage Of One Stone For Cleaning
(39)
باب الرُّخْصَةِ فِي الاِسْتِطَابَةِ بِحَجَرٍ وَاحِدٍ ‏‏
Sunan an-Nasa'i 43
It was narrated from Salamah bin Qais that the Messenger of Allah (ﷺ) said:
"When you clean yourselves (with stones, after defecating), use an odd number."
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاَهِيمَ، قَالَ أَنْبَأَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ هِلاَلِ بْنِ يِسَافٍ، عَنْ سَلَمَةَ بْنِ قَيْسٍ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ إِذَا اسْتَجْمَرْتَ فَأَوْتِرْ ‏"‏ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan an-Nasa'i 43
In-book reference : Book 1, Hadith 43
English translation : Vol. 1, Book 1, Hadith 43