Full Sharh — Sunan Abu Dawud 211
حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، حَدَّثَنَا مُعَاوِيَةُ، - يَعْنِي ابْنَ صَالِحٍ - عَنِ الْعَلاَءِ بْنِ الْحَارِثِ، عَنْ حَرَامِ بْنِ حَكِيمٍ، عَنْ عَمِّهِ عَبْدِ اللَّهِ بْنِ سَعْدٍ الأَنْصَارِيِّ، قَالَ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَمَّا يُوجِبُ الْغُسْلَ وَعَنِ الْمَاءِ يَكُونُ بَعْدَ الْمَاءِ فَقَالَ " ذَاكَ الْمَذْىُ وَكُلُّ فَحْلٍ يُمْذِي فَتَغْسِلُ مِنْ ذَلِكَ فَرْجَكَ وَأُنْثَيَيْكَ وَتَوَضَّأْ وُضُوءَكَ لِلصَّلاَةِ " .
English Translation
Narrated Abdullah ibn Sa'd al-Ansari: I asked the Messenger of Allah (ﷺ) as to what makes it necessary to take a bath and about the (prostatic) fluid that flows after taking a bath. He replied: that is called madhi (prostatic fluid). It flows from every male. You should wash your private parts and testicles because of it and perform ablution as you do for prayer
Source
Sunan Abu Dawud(سنن أبي داود)
Purification (Kitab Al-Taharah)
Hadith Number
211
Grade
Sahih