Sahih al-Bukhari 5630

Abū Nuʿaym narrated to us: Shaybān narrated to us, from Yaḥyā, from ʿAbd Allāh ibn Abī Qatādah, from his father, who said: The Messenger of Allah ﷺ said, “When any of you drinks, let him not breathe into the vessel. When any of you urinates, let him not touch his penis with his right hand; and when any of you cleans himself, let him not clean himself with his right hand.”