Sunan an-Nasa'i 155
سنن النسائي#155Da'ifأَخْبَرَنَا عُثْمَانُ بْنُ عَبْدِ اللَّهِ، قَالَ أَنْبَأَنَا أُمَيَّةُ، قَالَ حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، أَنَّ رَوْحَ بْنَ الْقَاسِمِ، حَدَّثَهُ عَنِ ابْنِ أَبِي نُجَيْحٍ، عَنْ عَطَاءٍ، عَنْ إِيَاسِ بْنِ خَلِيفَةَ، عَنْ رَافِعِ بْنِ خَدِيجٍ، أَنَّ عَلِيًّا، أَمَرَ عَمَّارًا أَنْ يَسْأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الْمَذْىِ فَقَالَ " يَغْسِلُ مَذَاكِيرَهُ وَيَتَوَضَّأُ " .
It was narrated from Rafi' bin Khadij that 'Ali told 'Ammar to ask the Messenger of Allah (ﷺ) about prostatic fluid, and he said:'Let him wash his male member and perform Wudu
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: 1:156