Muwatta Malik #86
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 أَبِيهِ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَالَ إِنِّي لأَجِدُهُ يَنْحَدِرُ مِنِّي مِثْلَ الْخُرَيْزَةِ فَإِذَا وَجَدَ ذَلِكَ أَحَدُكُمْ فَلْيَغْسِلْ ذَكَرَهُ وَلْيَتَوَضَّأْ وُضُوءَهُ لِلصَّلاَةِ يَعْنِي الْمَذْىَ .
Yahya related to me from Zayd ibn Aslam from his father that Umar
ibn al-Khattab said, "I find it dropping from me like small beads.
When you find that, wash your penis and do wudu as for prayer."
Topics
About Muwatta Malik
This hadith is #86 from Muwatta Malik, in the Book of Purity.