Is it permissible to kill one who insults Allah or the religion without taking him to the court?

Question:
Honorable Shaykh, may Allah grant you success. If a person kills another because the victim insulted the Lord and insulted the religion, is there blame on the perpetrator before Allah on the Day of Judgment?

Answer:
It is not permissible. The hudud (fixed Qur'anic punishments) are not carried out, neither the hadd for apostasy nor any other, except by the judge or the one in authority by a Shari'ah ruling. Chaos is not permissible, with everyone saying, "So-and-so has apostatized, I will kill him," and "So-and-so did such-and-such." This is not permissible. The hudud are within the jurisdiction of the one in authority, and the implementation of qisas (retaliation in kind) is within the jurisdiction of the one in authority, in order to keep matters in order and prevent chaos.