Hadith 10:154
Abu Huraira reported the Prophet as saying, “When a man has two wives and does not treat them equally he will come on the day of resurrection with a side hanging down.” Tirmidhi, Abu Dawud, Nasa’i, Ibn Majah and Darimi transmitted it.
وَعَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا كَانَتْ عِنْدَ الرَّجُلِ امْرَأَتَانِ فَلَمْ يَعْدِلْ بَيْنَهُمَا جَاءَ يَوْمَ الْقِيَامَةِ وَشِقُّهُ سَاقِطٌ» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَالنَّسَائِيُّ وَابْنُ مَاجَهْ والدارمي
Original Reference: Mishkat al-Masabih 3236