Sahih al-Bukhari - Book 52, Hadith 49
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Narrated Aisha: Whenever Allah's Messenger (ﷺ) intended to go on a journey, he used to draw lots among his wives and would take with him the one on whom the lot fell. He also used to fix for everyone of his wives a day and a night, but Sauda bint Zam`a gave her day and night to `Aisha, the wife of the Prophet (ﷺ) intending thereby to please Allah's Messenger (ﷺ).
How the Prophet ص modelled this behaviour here
Justice & Fairness
“He also used to fix for everyone of his wives a day and a night”
Treats his wife (and co-wives) justly and equitably; honors her rights and gives her what is due without wronging her.