Jami` at-Tirmidhi 1166
جامع الترمذي#1166Hasanحَدَّثَنَا قُتَيْبَةُ، وَغَيْرُ، وَاحِدٍ، قَالُوا حَدَّثَنَا وَكِيعٌ، عَنْ عَبْدِ الْمَلِكِ بْنِ مُسْلِمٍ، وَهُوَ ابْنُ سَلاَّمٍ عَنْ أَبِيهِ، عَنْ عَلِيٍّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا فَسَا أَحَدُكُمْ فَلْيَتَوَضَّأْ وَلاَ تَأْتُوا النِّسَاءَ فِي أَعْجَازِهِنَّ " . قَالَ أَبُو عِيسَى وَعَلِيٌّ هَذَا هُوَ عَلِيُّ بْنُ طَلْقٍ .
Ali narrated that The Messenger of Allah said:“When one of you breaks wind then let him perform Wudu, and do not go into your women through their behinds.”
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 12:21