"Whoever has two wives and is inclined to favor one of them over the other, he will come on the Day of Resurrection with half of his body leaning." (Using translation from Nasāʾī 3942)  

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ كَانَ لَهُ امْرَأَتَانِ يَمِيلُ لِإِحْدَاهُمَا عَلَى الْأُخْرَى جَاءَ يَوْمَ الْقِيَامَةِ أَحَدُ شِقَّيْهِ مَائِلٌ»  

"The Messenger of Allah used to divide his time equally among his wives, then he would say 'O Allah, this is what I am doing with regard to that which is within my control, so do not hold me accountable for that which is under Your control and is beyond my control.'" (Using translation from Ibn Mājah 1971)   

كَانَ رَسُولُ اللهِ ﷺ يَقْسِمُ بَيْنَ نِسَائِهِ فَيَعْدِلُ ثُمَّ يَقُولُ «اللهُمَّ هَذَا فِعْلِي فِيمَا أَمْلِكُ فَلَا تَلُمْنِي فِيمَا تَمْلِكُ وَلَا أَمْلِكُ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ أَرْسَلَهُ حَمَّادُ بْنُ زَيْدٍ