Marthad bin 'Abdullah al-Yazni مرثد بن عبد الله اليزني · Marriage (Kitab Al-Nikah)

A’ishah wife of the Prophet (ﷺ) reported “When the Apostle of Allaah(ﷺ) intended to go on a journey he cast lots amongst his wives and the one who was chosen by lot went on it with him. He divided his time, day and night (equally) for each of his wives except that Saudah daughter of Zam’ah gave her day to A’ishah.