Sunan an-Nasa'i - Book 36, Hadith 5
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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.
How the Prophet ص modelled this behaviour here
Justice & Fairness
“The Messenger of Allah used to divide his time equally among his wives”
Treats his wife (and co-wives) justly and equitably; honors her rights and gives her what is due without wronging her.