Mishkat al-Masabih, hadith 3108

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

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.