Sahih Bukhari
Bathing (Ghusl)
Volume: 001 / Book Number: 005 / Hadith Number: 280
Narrated Um-Salama:
(the mother of the believers) Um Sulaim, the wife of Abu Talha, came to Allah's Apostle and said, "O Allah's Apostle! Verily Allah is not shy of (telling you) the truth. Is it necessary for a woman to take a bath after she has a wet dream (nocturnal sexual discharge)?" Allah's Apostle replied, "Yes, if she notices a discharge."