Sahih al-Bukhari 282
صحيح البخاري#282SahihNarrated Um-Salama:(the mother of the believers) Um Sulaim, the wife of Abu Talha, came to Allah's Messenger (ﷺ) and said, "O Allah's Messenger (ﷺ)! 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 Messenger (ﷺ) replied, "Yes, if she notices a discharge
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:34