What is the religious ruling on taking revenge on a doctor who caused great harm to a patient due to a misdiagnosis and an attempt to earn money, given the absence of a law to hold him accountable in the country?

It is not permissible, according to Islamic law, to seek revenge on a doctor, because he is only liable financially. Retribution (qisas) against a doctor occurs only if he treated the patient with their permission and did not intend to harm them. The judgment and resolution in such matters rest with the Sharia judiciary.

Ibn Al-Qayyim mentioned five scenarios regarding the ruling on a doctor:

1. A skilled doctor who gave the profession its due and whose hand did not err: There is no liability upon him. 2. An ignorant doctor who undertook treatment and the patient perished because of him: If the patient knew of his ignorance and gave him permission, then the doctor is not liable. But if the patient thought he was a competent doctor, then the doctor is liable. 3. A skilled doctor whose hand erred: He is liable, because it is an unintentional offense. 4. A skilled, diligent doctor who erred in his diligence and caused the patient's death: His blood money is either from the public treasury (Bayt al-Mal) or borne by the doctor's 'aqilah (male relatives on the father's side). 5. A skilled doctor who erred in treatment without the permission of the patient or their guardian: He is liable, because it resulted from an unauthorized act.