Musnad Ahmad 1009
‘Ali said:
I was a man who emitted a great deal of madhi and I felt too shy to ask the Prophet (ﷺ) [about that] because of his daughter, so I told al-Miqdad to ask him and he said: `Let him wash his private part and testicles and do wudoo’.
حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا هِشَامُ بْنُ عُرْوَةَ، عَنْ أَبِيهِ، قَالَ قَالَ عَلِيٌّ كُنْتُ رَجُلًا مَذَّاءً وَكُنْتُ أَسْتَحِي أَنْ أَسْأَلَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لِمَكَانِ ابْنَتِهِ فَأَمَرْتُ الْمِقْدَادَ فَسَأَلَهُ فَقَالَ يَغْسِلُ ذَكَرَهُ وَأُنْثَيَيْهِ وَيَتَوَضَّأُ‏.‏