I recommend reading Acts 15. Some people were saying you need to be circumcised, i.e., keep the law of Moses, to be saved.
Acts 15
1Certain people came down from Judea to Antioch and were teaching the believers: “Unless you are circumcised, according to the custom taught by Moses, you cannot be saved.”
The apostles and elders had a meeting about it and disagreed. Peter explains further in the chapter, concluding with the following remarks.
Acts 15
19“It is my judgment, therefore, that we should not make it difficult for the Gentiles who are turning to God.
20Instead we should write to them, telling them to abstain from food polluted by idols, from sexual immorality, from the meat of strangled animals and from blood.
21For the law of Moses has been preached in every city from the earliest times and is read in the synagogues on every Sabbath.”
I get your point, but this is a complicated matter to discuss. I say that because Paul, Peter, and James were all present at this meeting, and they all seemed to hold either themselves, or others, or both accountable to certain aspects of the law of Moses.
Paul:
Acts 23
1And Paul, earnestly beholding the council, said, Men
and brethren, I have lived in all good conscience before God until this day.
2And the high priest Ananias commanded them that stood by him to smite him on the mouth.
3Then said Paul unto him, God shall smite thee,
thou whited wall: for sittest thou to judge me after the law, and commandest me to be smitten contrary to the law?
4And they that stood by said, Revilest thou God's high priest?
5Then said Paul, I wist not, brethren, that he was the high priest:
for it is written, Thou shalt not speak evil of the ruler of thy people.
The bold-faced part was written in Exodus 22:28, and Paul certainly seemed to still hold himself accountable to it after becoming a Christian himself.
Peter:
1 Peter 1
13Wherefore gird up the loins of your mind, be sober, and hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ;
14As obedient children, not fashioning yourselves according to the former lusts in your ignorance:
15But as he which hath called you is holy, so be ye holy in all manner of conversation;
16Because it is written, Be ye holy; for I am holy.
The bold-faced part was written in Leviticus 11:44-45 and 19:2, and Peter certainly seemed to be holding Christians accountable to it after becoming a Christian himself.
James:
James 2
8If ye fulfil the royal law according to
the scripture, Thou shalt love thy neighbour as thyself, ye do well:
9But if ye have respect to persons, ye commit sin, and are convinced of the law as transgressors.
The bold-faced part was written in Leviticus 19:18, and James certainly seemed to be admonishing Christians to fulfill the royal law by keeping it after becoming a Christian himself.
There are other examples that I could give from the New Testament, but I hope that you understand the point that I'm trying to make.