Sunan an-Nasa'i 439
سنن النسائي#439Sahihأَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ لَيْثِ بْنِ سَعْدٍ، عَنْ بُكَيْرِ بْنِ الأَشَجِّ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، قَالَ أَرْسَلَ عَلِيُّ بْنُ أَبِي طَالِبٍ - رضى الله عنه - الْمِقْدَادَ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم يَسْأَلُهُ عَنِ الرَّجُلِ يَجِدُ الْمَذْىَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " يَغْسِلُ ذَكَرَهُ ثُمَّ لْيَتَوَضَّأْ " .
It was narrated that Sulaiman bin Yasar said:"Ali bin Abi Talib sent Al-Miqdad to the Messenger of Allah (ﷺ) to ask him about a man who notices Madhi. The Messenger of Allah (ﷺ) said: 'Let him wash his penis then 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: 4:45