Whenever Messenger of Allah ﷺ wanted to go on a journey, he would draw lots as to which of his wives would accompany him. He would take her whose name came out. He used to fix for each of them a day and a night. But Sauda bint Zamʿa gave up her (turn) day and night to ʿAisha, the wife of the Prophet in order to seek the pleasure of Messenger of Allah ﷺ (by that action). (Using translation from Bukhārī 2593)  

«كَانَ رَسُولُ اللهِ ﷺ إِذَا أَرَادَ سَفَرًا أَقْرَعَ بَيْنَ نِسَائِهِ فَأَيَّتُهُنَّ خَرَجَ سَهْمُهَا خَرَجَ بِهَا مَعَهُ وَكَانَ يَقْسِمُ لِكُلِّ امْرَأَةٍ مِنْهُنَّ يَوْمَهَا وَلَيْلَتَهَا غَيْرَ أَنَّ سَوْدَةَ بِنْتَ زَمْعَةَ وَهَبَتْ يَوْمَهَا وَلَيْلَتَهَا لِعَائِشَةَ تَبْتَغِي بِذَلِكَ رِضَى رَسُولَ اللهِ ﷺ»  

We presented ourselves along with Ibn ʿAbbas at the funeral procession of Maimuna at a place called Sarif. Ibn ʿAbbas said, "This is the wife of the Prophet ﷺ so when you lift her bier, do not Jerk it or shake it much, but walk smoothly because the Prophet ﷺ had nine wives and he used to observe the night turns with eight of them, and for one of them there was no night turn." (Using translation from Bukhārī 5067)   

حَضَرْنَا مَعَ ابْنِ عَبَّاسٍ جِنَازَةَ مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ بِسَرِفَ فَقَالَ ابْنُ عَبَّاسٍ «هَذِهِ زَوْجُ رَسُولِ اللهِ ﷺ فَإِذَا رَفَعْتُمْ نَعْشَهَا فَلَا تُزَعْزِعُوهَا وَلَا تُزَلْزِلُوهَا وَارْفُقُوا فَإِنَّهُ كَانَ عِنْدَ رَسُولِ اللهِ ﷺ تِسْعٌ فَكَانَ يَقْسِمُ لِثَمَانٍ وَلَا يَقْسِمُ لِوَاحِدَةٍ»