Full Sharh — Sunan an-Nasa'i 193
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَعَلِيُّ بْنُ حُجْرٍ، - وَاللَّفْظُ لِقُتَيْبَةَ - قَالَ حَدَّثَنَا عَبِيدَةُ بْنُ حُمَيْدٍ، عَنِ الرُّكَيْنِ بْنِ الرَّبِيعِ، عَنْ حُصَيْنِ بْنِ قَبِيصَةَ، عَنْ عَلِيٍّ، - رضى الله عنه - قَالَ كُنْتُ رَجُلاً مَذَّاءً فَقَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا رَأَيْتَ الْمَذْىَ فَاغْسِلْ ذَكَرَكَ وَتَوَضَّأْ وُضُوءَكَ لِلصَّلاَةِ وَإِذَا فَضَخْتَ الْمَاءَ فَاغْتَسِلْ " .
English Translation
It was narrated that 'Ali said:"I was one who had a lot of prostatic discharge, and the Messenger of Allah (ﷺ) said to me: 'If you see Madhi (prostatic fluid) then wash your penis and perform Wudu' like that for Salah, but if you ejaculate semen, then perform Ghusl
Source
Sunan an-Nasa'i(سنن النسائي)
The Book of Purification
Hadith Number
193
Grade
Sahih