Shaikhul Islaam Ibn Taymiyyah (rahimahullaah) said:

The basis of the misguidance of these ones is their belief about the Imaams of guidance and the main body of Muslims that they have exited the (confines) of justice and that they are misguided. This is the approach of those who have abandoned the Sunnah, such as the raafidah and those similar to them. So what they view to be oppression, they consider it to be disbelief and then innovate rulings for it. These are the three positions of those who exit the Sunnah in every situation, such as the Harooriyyah, the raafidah and those similar to them. They abandon some of the fundamental principles of the Islamic Religion until they come out of it, just like an arrow goes through a hunted game’.

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[Majmoo 28/496]