Final answer:
The origin of the natural law is both religious and philosophical, tracing back to the Old Testament and classical philosophers.
Step-by-step explanation:
The very origin of the "natural law" can be traced back to both religious and philosophical sources. In terms of religious origin, the natural law is linked to the Old Testament and early Church Fathers who saw it as part of the natural foundation of Christianity. From a philosophical perspective, the natural law dates back to classical philosophers such as Socrates, Plato, Aristotle, and the Stoics, who observed human nature and deduced values intrinsic to it. These two origins have influenced the development and understanding of the natural law concept.