Just then a man came up to Jesus and asked, “Teacher, what good thing must I do to get eternal life?”
17 “Why do you ask me about what is good?” Jesus replied. “There is only One who is good. If you want to enter life, keep the commandments.”
18 “Which ones?” he inquired.
Jesus replied, “‘You shall not murder, you shall not commit adultery, you shall not steal, you shall not give false testimony, 19 honor your father and mother,’ and ‘love your neighbor as yourself.’”
And added to that abstain from sexual immorality.
If one loves as Jesus loves those commandments are fulfilled.
Paul saw all the law as law and considered the law in judgments he made such as ,For Scripture says, "Do not muzzle an ox while it is treading out the grain," and "The worker deserves his wages."
Paul rebuked wickedness and upheld the commandments Jesus emphasized. He also knew that righteousness in Christ was credited to us by faith and aware of the new covenant. As he noted the freedom in Christ from the ceremony laws.
Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day.
And Paul noted the importance was in faith expressing itself through love not in works of the law such as circumcision.
They were not made clean by works but by faith in Jesus.
When Jesus saw their faith, he said to the paralyzed man, "Son, your sins are forgiven."
Jesus answered him, "Truly I tell you, today you will be with me in paradise."
As for many in Israel it was written:
Since they did not know the righteousness of God and sought to establish their own, they did not submit to God's righteousness.
So I agree with you in part we use the NT as a guide as to which commandments Jesus is enforcing. We have freedom in Christ but we are not free to continue to sin.