Sahih Muslim
The Book of Menstruation (Kitab Al-Haid)
Book Number: 003 / Hadith Number: 593
'Ali reported: I was one whose prostatic fluid flowed readily and I was ashamed to ask the Apostle (may peace be upon him) about it, because of the position of his daughter. I, therefore, asked Miqdad. b. al-Asad and he inquired of him (the Holy Prophet). He (the Holy Prophet) said: He should wash his male organ and perform ablution.