(25) باب النَّهْىِ عَنِ التَّنَفُّسِ، فِي الإِنَاءِ
Narrated Abu Qatada:
Allah's Messenger (ﷺ) said, "When you drink (water), do not breath in the vessel; and when you urinate, do not touch your penis with your right hand. And when you cleanse yourself after defecation, do not use your right hand."
Reference: Sahih al-Bukhari 5630
In-book reference: Book 74, Hadith 56
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 69, Hadith 534