Paul said the law is spiritual, holy, just, and good, and we do not void out the law through faith, but we establish the law, live up to it.
But Paul said he is carnal sold under sin so he could not live up to the law, but a person that hates sin, and does not want sin then by the Spirit they can abstain from sin for a Spirit led life will not fulfill the lusts of the flesh for they have crucified the flesh with the affections and lusts.
Therefore a person that is led of the Spirit is not under the law for all their sins are forgiven, and they are not sinning obeying the law so the law cannot touch them for prosecution.
If you offend in the least of the law then you offend in all.
That which is natural is first then that which is spiritual.
The Old Testament was a physical covenant with physical laws and only for a benefit on earth, but the spiritual laws was there in the Old Testament.
God had them do physical ordinances that they could keep, but the spiritual law they would fail at for they could not have the Spirit and only had the power of the flesh to keep them, and it is the spiritual law, laws of love, moral laws obeyed perfectly that cause us to be right before God that they could never live up to perfectly.
The blood of bulls and goats covered their sins until Christ shed His blood to wash their sins away completely, and if they did not have the blood of bulls and goats to cover their sins they would not be right with God, and they would of died with sins and then the blood of Christ could not wash away their sins.
When Jesus and the saints rule over the world over the people that God spared at the battle of Armageddon the heathen have to go up year after year to Jerusalem to worship Jesus, and keep the feast of tabernacles a physical ordinance to be right with God for they cannot be spiritual for they followed the man of sin.
A person could obey the Old Testament physical ordinances and have the blood of animals cover their sins and they would receive the blessings of the Old Testament concerning this physical world upon them but would not receive spiritual salvation which Israel is blinded in part which they acknowledge the Old Testament for the majority but not the New so going by the Old Testament and not the New they are blinded in part and not totally blinded.
Righteousness cannot come by the law the physical laws without a doubt, and it cannot come by the spiritual laws without the Spirit, but by the Spirit we can establish the law, live up to it, for a Spirit led life gives us the power to overcome the flesh and abstain from sin.
But some people have a form of godliness, but they deny the Spirit leading them, ever learning and never able to come to the knowledge of the truth, and believe they are in a position of salvation despite holding unto sin.