Ablutions (Wudu')
4/18. Chapter:
It is forbidden to clean the private parts with the right hand
Sahih Bukhari
حَدَّثَنَا مُعَاذُ بْنُ فَضَالَةَ، قَالَ حَدَّثَنَا هِشَامٌ ـ هُوَ الدَّسْتَوَائِيُّ ـ عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي قَتَادَةَ، عَنْ أَبِيهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا شَرِبَ أَحَدُكُمْ فَلاَ يَتَنَفَّسْ فِي الإِنَاءِ، وَإِذَا أَتَى الْخَلاَءَ فَلاَ يَمَسَّ ذَكَرَهُ بِيَمِينِهِ، وَلاَ يَتَمَسَّحْ بِيَمِينِهِ ".
Narrated Abu Qatada: Allah's Messenger (ﷺ) said, "Whenever anyone of you drinks water, he should not breathe in the drinking utensil, and whenever anyone of you goes to a lavatory, he should neither touch his penis nor clean his private parts with his right hand."
Reference : Sahih al-Bukhari 153In-book reference : Book 4, Hadith 19USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 155