Sahih al-Bukhari - Book 56, Hadith 94
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Narrated `Aisha: Whenever the Prophet (ﷺ) intended to proceed on a journey, he used to draw lots amongst his wives and would take the one upon whom the lot fell. Once, before setting out for Jihad, he drew lots amongst us and the lot came to me; so I went with the Prophet; and that happened after the revelation of the Verse Hijab (i.e. veiling).
How the Prophet ص modelled this behaviour here
Justice & Fairness
“he used to draw lots amongst his wives and would take the one upon whom the lot fell”
Treats his wife (and co-wives) justly and equitably; honors her rights and gives her what is due without wronging her.