Muwatta Malik #87
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ جُنْدَبٍ، مَوْلَى عَبْدِ اللَّهِ بْنِ عَيَّاشٍ أَنَّهُ قَالَ سَأَلْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ عَنِ الْمَذْىِ، فَقَالَ إِذَا وَجَدْتَهُ فَاغْسِلْ فَرْجَكَ وَتَوَضَّأْ وُضُوءَكَ لِلصَّلاَةِ .
Yahya related to me from Malik from Zayd ibn Aslam from his
father that Jundub, the mawla of Abdullah ibn Ayyash, said, "I asked
Abdullah ibn Umar about prostatic fluid and he said, 'When you find
it, wash your genitals and do wudu as for prayer.' "
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About Muwatta Malik
This hadith is #87 from Muwatta Malik, in the Book of Purity.