Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) saying: "O Allah! I seek refuge in You from rulers of haraj (that is, of killing and plunder), who will lead my Ummah towards oppression."
Al-Tabarani recorded it in al-Mu'jam al-Awsat, and its chain is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الخلافة / 9204