It is narrated from Hazrat Umm Salamah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: Soon there will come six rulers, some of whose habits you will consider good and some you will disapprove of. So whoever disapproves will be free of responsibility, and whoever expresses dislike will be safe, but whoever is pleased and follows them (his case is different). The companions asked, "O Messenger of Allah, should we not fight against them?" The Prophet (peace and blessings be upon him) said, "No, as long as they lead you in the five prayers."