It is narrated from Sayyiduna Amr bin Sa'wa' al-Yafi'i (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There are seven whom I have cursed, and (the supplication of) every prophet is answered: the one who adds to the Book of Allah, the one who denies the decree of Allah, the one who treats as lawful what Allah has made sacred, the one who treats as lawful from my family (Ahl al-Bayt) what Allah has forbidden, the one who abandons my Sunnah, the one who selfishly appropriates the fay' (public wealth), and the one who behaves tyrannically through his authority in order to honour those whom Allah has disgraced and to disgrace those whom Allah has honoured."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14161