The Prophet ﷺ said, "One who treats those under his authority badly will not enter Paradise."
حدثنا أحمد بن منيع حدثنا يزيد بن هارون عن همام بن يحيى عن فرقد السبخي عن مرة
عن النبي ﷺ قال لا يدخل الجنة سيئ الملكة
[Its chain is daif] Ibn Majah also narrated it in the Book of Manners, chapter on Kindness to Slaves, hadith no. 3691, from the hadith of Farqad, by this same route, and he is daif as mentioned above. Marwazi also narrated it in Musnad Abu Bakr, hadith no. 97, and Busiri declared it daif because of Farqad.