It is narrated from Sayyiduna Abu Umamah al-Bahili (may Allah be pleased with him) that he said he heard the Messenger of Allah (peace and blessings be upon him) say: "I do not fear for my Ummah a famine that will kill them, nor an enemy that will destroy them; rather, I fear for my Ummah misguiding leaders: if they obey them, they will put them to trial, and if they disobey them, they will kill them."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7622