Sahih Muslim , Book 2, Hadith 511 (USC-MSA) ⓘ
Abu Qatada reported it from his father: The Messenger of Allah 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 " .
also referenced under: Book 2, Hadith 80 (In-Book) & Hadith 267 (Reference)