As a package of laws, the whole Old Covenant containing the Law of Moses, the covenant made at Mt. Sinai is obsolete. This was replaced by the new covenant. This does not mean however that all the laws found in the Law of Moses are all obsolete. Some of the laws — especially those pertaining to moral, spiritual laws — are very much applicable and should be observed by Christians today. But as a package of laws, the old covenant containing the Law of Moses is obsolete.
The new covenant was established (Heb. 8:13; 10:9; 8:6) by the blood of Jesus Christ (Luke 22:20), thus making the old covenant obsolete.
“In speaking of a new covenant, he makes the first one obsolete. And what is becoming obsolete and growing old is ready to vanish away.” (Hebrews 8:13)
“…then he added, “Behold, I have come to do your will.” He abolishes the first in order to establish the second.” (Hebrews 10:9)
“But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.” (Hebrews 8:6)
The word, “established” in Hebrews 8:6 is just that. It means that the new covenant has already begun. It has already been established. Other translations render it as, enacted or founded. There is no doubt that the old covenant is already obsolete.
The whole old covenant, “the law” or the “the law of Moses,” the covenant made at Mt. Sinai was merely added 430 years later after the Abrahamic covenant. It is critically important to understand what Paul is telling us in Galatians about the Law of Moses.
“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” (Galatians 3:17).
This particular “law” was added. Galatians 3:19 says, “What, then, was the purpose of the law? It was added because of transgressions until the Seed to whom the promise referred HAD COME. The law was put into effect through angels by a mediator.”
Some think this “law” is referring to the animal sacrifices. But that is incorrect. The animal sacrifices and rituals were not added to the Law of Moses. It was part and parcel of the whole law given at Mt. Sinai.
Now that Christ has come, we no longer need the Law of Moses contained in the old covenant made at Mt. Sinai. It was added as temporary set of rules to lead us to Christ. Galatians 3:23-25 says, “Before this faith came, we were held prisoners by the law, locked up until faith should be revealed. So the law was put in charge to lead us to Christ that we might be justified by faith. Now that faith has come, we are no longer under the supervision of the law.”
Now that Christ has come, we no longer need the temporary tutor (the Law of Moses, the old covenant). We have Christ!
For Further Study: