(12) باب إِذَا جَامَعَ ثُمَّ عَادَ، وَمَنْ دَارَ عَلَى نِسَائِهِ فِي غُسْلٍ وَاحِدٍ
Narrated 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).
Reference: Sahih al-Bukhari 268
In-book reference: Book 5, Hadith 21
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 5, Hadith 268