I shared this passage before but I just noticed something profound which I never observed before.
Extremism like ISIS has had many forms in history. The original incarnation began at the time of the Prophet Muhammad (peace be upon him) when a man named Dhu Al-Khuwaysirah accused the Messenger of God of being unjust directly in His presence! This is the tradition of these people who feign religiosity whilst going against everything our religion teaches. They claim they know more than the one God sent to teach us!