Nang
TOL Subscriber
Abel sacrificed an animal to God, as did Noah, and so did Job, and so did Abraham, all before the law as given to Moses.
Yep.
(The Covenant of Works with Adam was founded on the same Law as the Mosaic Covenant.)
Just as there is only one Gospel of Truth; there is also only one everlasting moral Law of God.
Adam received it, Moses reiterated it in the Decalogue, and all men are born accountable under it.
Only the promised Seed achieved perfect obedience, even to His death, to fulfill it.