Narrated Qatada: Anas bin Malik said, "The Prophet 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 the strength for it?" Anas replied, "We used to say that the Prophet 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).

Narrated Anas bin Malik: The Prophet used to visit all his wives in one night and he had nine wives at that time.

Narrated Anas: The Prophet used to go round (have sexual relations with) all his wives in one night, and he had nine wives.

Narrated Ibn `Abbas: Once I stayed overnight at the house of Maimuna and the Prophet was there with her. When it was the last third of the night, or some part of the night, the Prophet got up looking towards the sky and recited: 'Verily! In the creation of the heavens and the earth, and in the alternation of Night and Day, there are indeed signs for men of u understanding.' (3.190)