In Deuteronomy 30, it forms the basis for the New Covenant by prophesying about a time when the Israelites would return from exile, God would circumcise their hearts, and they would return to obedience to the Torah, which is what Jeremiah 31:33 and Ezekiel 36:26-27 are in regard to, so the New Covenant still involves following the same legal code.
In Matthew 5:17-19, Jesus said that he came to fulfill the law in contrast with saying that he came not to abolish it and he warned against relaxing the least part of it, so you should not interpret fulfilling the law as meaning the same thing as abolishing the legal code or as relaxing the least part of it. Rather, "to fulfill the law" means "to cause God's will (as made known in the law) to be obeyed as it should be" (NAS Greek Lexicon: pleroo), so after Jesus said that he came to fulfill the law in Matthew 5:17-19, he then proceeded to fulfill it throughout the rest of the chapter by correcting what the people had heard being said and by teaching how to correctly obey it as it was originally intended. According to Galatians 5:14, anyone who has loved their neighbor has fulfilled the entire law, so again it refers to correctly obeying it as it should be, moreover, it refers to something that countless people have done and should continue to do in perpetuity, not to something unique that only Jesus did or to making it obsolete. Likewise, in Galatians 6:2, bearing one another's burdens fulfills the Law of Christ, yet you do not consistently interpret that is making it obsolete.
Christ magnifying the law is the opposite of making it legal code to be no longer upon us.
All of God's righteous laws are eternal (Psalms 119:160), so none of them ceased with Christ's death. Again, one thing can only make another thing obsolete to the extent that it has cumulative functionality. In Acts 21:20-24, Paul's goal was to disprove false rumors that he had been teaching against obeying the Law of God and to show that he continue to live in obedience to it, not to deceive others into thinking that he continue to live in obedience to it while he actually did not.
I missed this post, sorry for the delay
There's a point where we need to recognize the legal code has changed. Circumcision of the heart was mentioned in the OT, but that doesn't abrogate physical circumcision in the old covenant. Physical circumcision persisted as legal code even while there was circumcision of the heart, whereas in the new it doesn't which Paul identifies on several occasions. Another major example is the sacrifice with clearly defined legal code in the old covenant that has changed in the new. We still value it, but its requirement is fulfilled not through our obvervance of legal code, but through Christ.
"Magnifying the law" needs to be unpacked better. Do not murder is the legal code. Like the rest of the 10 is a legal threshold that if crossed, we violate the covenant agreement but there are many steps before murder happens that are all sinful that the legal code itself does not define. So there is something more foundational than simply saying "do not murder", not merely a threshold compliance but an expansion to its core internal and spiritual values, producing heart-level obedience. This is magnified as "love your neighbour as yourself." This doesn't reject it but embraces it at a deeper level where the threshold compliance becomes obsolete. sin doesn't change (murder is still wrong), but the legal code threshold is not the thing that is aligning us (it's too weak) but something more foundational. Sure we can keep it and it's good not to murder, but that sort of misses the point because we need to go beyond the threshold compliance level. The legal code does not show us a complete moral code but "do not murder" and "love your neighbour as yourself" are still rooted in the same value, the former is obsolete and the latter is what we should align to. Both will have a result of not murdering (or lying, stealing, coveting, etc...), but "love your neighbour as yourself" will produce something far greater then the legal code articulates. It's still the same values but magnified and because of this, it is the better way.
Rom 7:1-6
1 Or do you not know, brothers—for I am speaking to those who know the law—that the law is binding on a person only as long as he lives? 2 For a married woman is bound by law to her husband while he lives, but if her husband dies she is released from the law of marriage. 3 Accordingly, she will be called an adulteress if she lives with another man while her husband is alive. But if her husband dies, she is free from that law, and if she marries another man she is not an adulteress.
4 Likewise, my brothers, you also have died to the law through the body of Christ, so that you may belong to another, to him who has been raised from the dead, in order that we may bear fruit for God. 5 For while we were living in the flesh, our sinful passions, aroused by the law, were at work in our members to bear fruit for death. 6 But now we are released from the law, having died to that which held us captive, so that we serve in the new way of the Spirit and not in the old way of the written code.
The widow is bound to her husband while he lives, but death triggers a release from that covenant. this doesn't not produce lawlessness, but instead she is free to marry again without breaking the old covenant agreement. Now, what is this law? v7 clears it up, saying "What then shall we say? That the law is sin? By no means!..." and v12 calls it "So the law is holy, and the commandment is holy and righteous and good."
Paul is not speaking of the law of sin here that he later addressed in v23. he is speaking of the old covenant and addresses the legal code in v6 itself. we are not just released from the condemnation of the law (Rom 8:1) but of it's authoriy as well (v1 and 6 make this clear). Paul's example of the widow is not to show she was married to sin, but was bound to a former covenant that has been released through death. His language is not protesting law (or reject, abolish, throw away, etc...) but that we are released from it.
