كتاب 2
2  
Book 2
(2)
Chapter 2
(2)
باب 2
Muwatta Malik 86
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."
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 ‏.‏
Reference : Muwatta Malik 86
In-book reference : Book 2, Hadith 34264
USC-MSA web (English) reference : Book 7, Hadith 86
  (deprecated numbering scheme)