Chapter 36: The Book of the Kind Treatment of Women
It was narrated that 'Aishah said: "The Messenger of Allah used to divide his time equally among his wives then he would say: 'O Allah, this is what I have done with regard to that over which I have control, so do not blame me for that over which You have control and I do not.'"
Hammad bin Zaid narrated it in Mursal form.
Sunan an-Nasa'i 3943