The Messenger of Allah ﷺ said, "When one of you uses stones to clean himself, let him use an odd number."
حدثنا عفان حدثنا أبو عوانة حدثنا عمر بن أبي سلمة عن أبيه
قال رسول الله ﷺ إذا استجمر أحدكم فليوتر
No references are available.
Its isnad is sahih. It has already appeared at 8150. It is found in Muslim, in the Book of Purification, with similar wording, number 20-24, and Tirmidhi 27, and Nasai 1/41, and Ibn Majah 406, and Ibn Abu Shayba 1/27, and Tabarani in Al-Kabir, 7/41.