Sahih al-Bukhari 268
صحيح البخاري#268SahihNarrated Qatada:Anas bin Malik said, "The Prophet (ﷺ) used to visit all his wives in a round, during the day and night and they were eleven in number." I asked Anas, "Had the Prophet (ﷺ) the strength for it?" Anas replied, "We used to say that the Prophet (ﷺ) was given the strength of thirty (men)." And Sa`id said on the authority of Qatada that Anas had told him about nine wives only (not eleven)
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: 5:21