It is narrated from Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever is given authority over a group, whether few or many, from my Ummah, and then does not act with justice, Allah Almighty will cast him face down into Hell.
Hadith Referenceالفتح الربانی / كتاب الخلافة والإمارة / 12041