Hadith: None of you should hold his penis with his right hand while urinating, nor wipe himself after answering the call of nature using his right hand, nor breathe into the vessel

عَنْ أَبِي قَتَادَةَ رضي الله عنه قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ:
«لَا يُمْسِكَنَّ أَحَدُكُمْ ذَكَرَهُ بِيَمِينِهِ وَهُوَ يَبُولُ، وَلَا يَتَمَسَّحْ مِنَ الْخَلَاءِ بِيَمِينِهِ، وَلَا يَتَنَفَّسْ فِي الْإِنَاءِ».
[صحيح] - [متفق عليه] - [صحيح مسلم: 267]

Abu Qatādah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"None of you should hold his penis with his right hand while urinating, nor wipe himself after answering the call of nature using his right hand, nor breathe into the vessel."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Muslim - 267]

Explanation

The Prophet (may Allah's peace and blessings be upon him) clarified here some manners as he forbade men from holding their penis with their right hand while urinating and forbade the act of removing impurity from the private parts, front or back, with the right hand because the right hand is meant to be used for noble matters. He also forbade breathing into the vessel from which one is drinking.