According to jurisprudence, law exists and has always existed, beyond statute and case law, and is based on common sense, universal values, and the principles of natural justice. Google principles of natural justice.
Rule BY law is not law at all. God cannot be a source in law. That’s why the Supreme Court of India ruled that syariah is not law.
Law must have source to have authority, jurisdiction and power.
Watch . . . Supreme Court of India’s retired Hon’ble Justice Markandey Katju’s daring speech via video.