Sahih Muslim #613 · The Book of Marriage

Sahih MuslimAbu Qatada reported it from his father
Sahih Muslim · Book 16 · The Book of Marriage
Sahih Muslim · كتاب 16 · كتاب النكاح
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).
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ هَمَّامٍ، عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي قَتَادَةَ، عَنْ أَبِيهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ لاَ يُمْسِكَنَّ أَحَدُكُمْ ذَكَرَهُ بِيَمِينِهِ وَهُوَ يَبُولُ وَلاَ يَتَمَسَّحْ مِنَ الْخَلاَءِ بِيَمِينِهِ وَلاَ يَتَنَفَّسْ فِي الإِنَاءِ ‏"‏ ‏.‏
Reference : Sahih Muslim 613In-book reference : Book 2, Hadith 80