Who are the Qa'diyyah?

Question:
The questioner says: I read in some books that the most dangerous of the Khawarij sects are the Qa'diyyah. Who are these people? And what does their danger consist of?

Answer:
The Khawarij are those who rebel against the one in authority due to a transgression that is less than disbelief. They rebel against the one in authority and break the bond of obedience under the pretext of enjoining good and forbidding evil. These are the Khawarij. They are called Khawarij because they went out from obedience. Part of the Khawarij’s doctrine is that they declare Muslims to be disbelievers; they declare those who commit major sins that are less than shirk (associating partners with Allah) to be disbelievers. So they declare the fornicator, the thief, the drinker of intoxicants, and the doers of major sins that are less than shirk to be disbelievers. This is the Khawarij’s doctrine of takfir (declaring someone a disbeliever). Yes.