Sahih Muslim 303 a
'Ali reported:
I was one whose prostatic fluid flowed readily and I was ashamed to ask the Apostle (ﷺ) about it, because of the position of his daughter. I, therefore, asked Miqdad. b. al-Asad and he inquired of him (the Holy Prophet). He (the Holy Prophet) said: He should wash his male organ and perform ablution.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، وَأَبُو مُعَاوِيَةَ وَهُشَيْمٌ عَنِ الأَعْمَشِ، عَنْ مُنْذِرِ بْنِ يَعْلَى، - وَيُكْنَى أَبَا يَعْلَى - عَنِ ابْنِ الْحَنَفِيَّةِ، عَنْ عَلِيٍّ، قَالَ كُنْتُ رَجُلاً مَذَّاءً وَكُنْتُ أَسْتَحْيِي أَنْ أَسْأَلَ النَّبِيَّ صلى الله عليه وسلم لِمَكَانِ ابْنَتِهِ فَأَمَرْتُ الْمِقْدَادَ بْنَ الأَسْوَدِ فَسَأَلَهُ فَقَالَ ‏
"‏ يَغْسِلُ ذَكَرَهُ وَيَتَوَضَّأُ ‏"‏ ‏.‏