The Messenger of Allah (ﷺ) said: None of you should hold penis with his right hand while urinating, or wipe himself with his right hand in privy and should not breathe into the vessel (from which he drinks).
Reference: Sahih Muslim 267a In-book : Book 2, Hadith 80 USC-MSA web (English) : Book 2, Hadith 511 (deprecated)
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