What did God first reveal to man as the rule of obedience?

The correct answer is the moral law, which serves as the foundational principle for humanity's understanding of right and wrong. This law, often associated with the Ten Commandments, encompasses ethical directives about how to live in accordance with God's will, establishing a standard for moral behavior that transcends specific cultural or temporal contexts.

In theological discussions, the moral law is viewed as universally applicable, rooted in the very character of God, and intended for all people at all times. It reflects God's holiness and righteousness, making it essential for guiding human conduct. Unlike the ceremonial and judicial laws, which were specific to the Israelite community and its context, the moral law is understood to be binding on all of humanity.

The ceremonial law pertains to the rituals, sacrifices, and worship practices of ancient Israel, while the judicial law refers to the legal guidelines specific to the governance of the nation of Israel. The covenant of grace, on the other hand, focuses on the relationship of salvation and promise found in Christ, rather than the overarching moral guidelines that govern ethical behavior.

Thus, the moral law stands as the first and foremost rule of obedience revealed by God, establishing a framework for how humans should conduct themselves in alignment with divine will.