مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 302
Purification
Circumstances which make ablution necessary - Section 1
وَعَن عَليّ قَالَ: كُنْتُ رَجُلًا مَذَّاءً فَكُنْتُ أَسْتَحْيِي أَنْ أَسْأَلَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لِمَكَانِ ابْنَتِهِ فَأَمَرْتُ الْمِقْدَادَ فَسَأَلَهُ فَقَالَ: «يَغْسِلُ ذَكَرَهُ وَيتَوَضَّأ»
‘Ali said: My prostatic fluid flowed readily, and I was ashamed to consult the Prophet (ﷺ) because of the position of his daughter so I gave orders to al-Miqdad to consult him, and the Prophet (ﷺ) said, “He must wash his penis and perform ablution.” (Bukhari and Muslim.)
Mishkat al-Masabih, 302مُتَّفق عَلَيْهِ (الألباني)