Q40. What did God first reveal to humanity as the rule of obedience?
The rule that God first revealed to humanity for obedience was the moral law.
Scripture Proofs — King James Version
1
Romans 2:14–15
“For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)”
Romans 10:5
“For Moses describeth the righteousness which is of the law, That the man which doeth those things shall live by them.”