The Prophet ﷺ said, "When a man has two wives and does not deal justly between them, he will come on the Day of Resurrection with one of his sides hanging down."
حدثنا محمد بن بشار حدثنا عبد الرحمن بن مهدي حدثنا همام عن قتادة عن النضر بن أنس عن بشير بن نهيك
عن النبي ﷺ قال إذا كان عند الرجل امرأتان فلم يعدل بينهما جاء يوم القيامة وشقه ساقط
Its chain of transmission is daif. Nasai narrated it in 7/63, hadith 3394 (Companionship of Women, chapter on a man's inclining toward some of his wives rather than others) from the hadith of Ibn Mahdi, and Abu Dawud, hadith 2133, and Ibn Majah, hadith 1969, from the hadith of Hammam through the same route. Ibn Hibban graded it sahih, hadith 1307, as did Ibn Jarud, hadith 722, and Hakim, 2/186, and Dhahabi and others.Qatada is a mudallis who narrated this with "an" (an ambiguous form of transmission), and the hadith has a daif corroborating narration.