No one of you should hold his penis with his right hand while urinating, or clean himself after answering the call of nature using his right hand, or breathe into the vessel. [Al-Bukhari]

"عن أبي قتادة الأنصاري -رضي الله عنه- مرفوعاً: ""لا يُمْسِكَنَّ أَحَدُكُم ذَكَره بَيمِينِه وهو يبول، ولا يَتَمَسَّحْ من الخلاء بيمينه، ولا يَتَنَفَّس في الإناء"". [صحيح.] - [متفق عليه.]"