Sahih Bukhari
Sahih Bukhari Volume 001, Book 005, Hadith Number 269.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 05. Bathing (Ghusl)
Narated By 'Ali : I used to get emotional urethral discharge frequently. Being the son-in-law of the Prophet I requested a man to ask him about it. So the man asked the Prophet about it. The Prophet replied, "Perform ablution after washing your organ (penis)."