Messenger of Allah ﷺ said, "When you drink (water), do not breath in the vessel; and when you urinate, do not touch your penis with your right hand. And when you cleanse yourself after defecation, do not use your right hand."  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا شَرِبَ أَحَدُكُمْ فَلاَ يَتَنَفَّسْ فِي الإِنَاءِ وَإِذَا بَالَ أَحَدُكُمْ فَلاَ يَمْسَحْ ذَكَرَهُ بِيَمِينِهِ وَإِذَا تَمَسَّحَ أَحَدُكُمْ فَلاَ يَتَمَسَّحْ بِيَمِينِهِ