The Prophet (ﷺ) said, "Whenever anyone of you makes water he should not hold his penis or clean his private parts with his right hand. (And while drinking) one should not breathe in the drinking utensil ."
Reference: Sahih al-Bukhari 154 In-book : Book 4, Hadith 20 USC-MSA web (English) : Vol. 1, Book 4, Hadith 156 (deprecated)
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