It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him), he says: One day I was walking side by side with the Noble Prophet (peace and blessings be upon him) towards his house when I heard him say: "Besides the Dajjal, there is another trial which I fear for my Ummah." When I became afraid that the Prophet (peace and blessings be upon him) was about to enter his house, I said: "O Messenger of Allah! What do you fear for your Ummah more than the Dajjal?" The Prophet (peace and blessings be upon him) said: "Misguiding rulers."