Your post becomes confusing when you make comments like these, which don't reflect either what Jesus stated nor what I posted. I fully affirm the reliability of the law as a record we can draw on, just as Paul does from Romans 3:31 through much of chapter 4, where the author refers to the Law 430 years before the covenant from Mount Sinai existed to show how Abraham believed God's ability to deliver on His promises, and it was accounted to Abraham for righteousness.
But you're attaching a meaning to 'passing away' that isn't germane to this.
When a prophecy is fulfilled, that completes it (consistent with the
meaning of the Greek pleroo used in Mathew 5:17). The prophecy is finished and no longer predicts an event in the future.
The same is true with the Law.
Read on...
Refer to what I wrote in my earlier post, as you omitted the pertinent Scripture quotes:
Once our transgressions under the first covenant have been redeemed, the pertinent Law has been completed: it is no longer able to impute sin to us, because we are no longer able to transgress the law. In effect, the law has lost its jurisdiction over God's redeemed children.
For fun sometime, compare what Jesus taught Peter according to Matthew 17:24-26 with Paul's comments in Galatians 4:1-7. Both of these passages affirms the limited jurisdiction of a given law (Jesus uses the example of the limited scope of the power to levy taxes). Both of these passages show that the law doesn't have jurisdiction over the King's children (or the Heir, in Paul's epistle). God's redemption changed how we are accounted, becoming God's adopted children, and no longer under the Law given exclusively to the children of Israel. Paul summarizes the Gospel in two verses, Galatians 4:4-5:
But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, 5 to redeem those who were under the law, that we might receive the adoption as sons.
The fulness of time was the Law's fulfillment, that placed the tenure of the Law over God's adopted children in the past tense.
All of this addresses the redeemed. Opening the scope to include those outside God's redemption is not my intent.