Sahih al-Bukhari 232
صحيح البخاري#232SahihNarrated `Aishah:I used to wash the semen off the clothes of the Prophet (ﷺ) and even then I used to notice one or more spots on them
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: 4:98