Sahih al-Bukhari 264
صحيح البخاري#264SahihNarrated Anas bin Malik:The Prophet (ﷺ) and one of his wives used to take a bath from a single pot of water. (Shu`ba added to Anas' Statement "After the Janaba)
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: 5:17