If you see a man from the Rafidah or the Nasibah or the Khawarij, is it permissible to kill him or to insult and abuse him?

Question:
If you see a man from the Rafidah or the Nasibah or the Khawarij, is it permissible to kill him or to insult and abuse him?

Answer:
It is not permissible for you to kill. Killing is not permissible; this is for the one in authority after calling to repent and after the legal procedures. Is chaos permissible? Everyone killing? This is not permissible. The hudud (fixed Qur'anic punishments) and qisas (retaliation in kind) are not established except by the rulers. Otherwise, chaos will result. Also, the legal ruling must be established, and this does not happen except with the judge. This is not a matter of chaos. However, if you disapprove of them and refute them, yes, refute them and disapprove of them, yes.