IS THE TEN COMMANDMENT LAW ETERNAL?
No, the Law is not eternal. Galatians 3:19 gives the purpose of the Law. It says: "What, then, was the purpose of he law? It was added because of transgressions until the Seed to whom the promise referred had come."
The law was given 430 years after Abraham. "What I mean is this: The law, introduced 430 years later, does not set aside the covenant previously established by God and thus do away with the promise. For if the inheritance depends on the law, then it no longer depends on a promise; but God in his grace gave it to Abraham through a promise." Galatians 3:17-18.
The Law had a definite beginning time (430 years after Abraham) and a definite ending time, --When the promised Seed (Christ, vs. 16) came.
Other Scriptures such as Romans 5:12-14 indicate that there can be sin in the world, even BEFORE the Law was given. "Therefore, just as through one man sin entered into the world, and death through sin, and so death spread to all men, because all sinned -- for until the Law sin was in the world; but sin is not imputed when there is no law. Nevertheless death reigned from Adam until Moses, even over those who had not sinned in the likeness of Adam's offense, who is a type of Him who was to come."
The Sabbath & Sunday