I believe the opposite of you cb, and I hope that is ok. I take my example from the Saviour, who quoted the "OT" when defending himself, other things, like Peter saying that there are those that can't understand Paul (NT) because they do not understand the Scriptures (OT). Or when He said that if you would believe Moses, you would believe Him, cause Moses wrote about Him. They grossly misunderstood the OT, therefore rejected the "cornerstone".
I see this today, where believers don't understand what the Annointed One meant about marriage, or what Paul said about himself or the Law because they don't understand the Law, much less how to explain it or interpret it.
So many passages that are twisted towards destruction because many don't understand the OT. Like 1 Tim 3 passages regarding "one wife". Understanding the OT and interpreting the passage with that will automatically change your mindset about THAT passage. Can't understand Hebrews without understanding the OT regarding priests and God's role for....
Anyway, I could go on and on I guess, I actually don't think we need to interpret one based on the other, we should see it as ONE book, that we compare against itself for proper understanding, or at least one is no more relevant than the other.
As per New Covenant and Old Covenant, I think they are the same thing, and I know I might take grief for this, but here it goes...
Hebrews 10:16
This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;
The Law in our hearts, not on stone, for all people, not just the "jews". Same covenant, just has to be remade, cause we broke it.
Yah:"Ahhh, you broke it, I will make you a new one, just like I said earlier."
Us:" Earlier?"
Yh:"Yes, you would know if you listened to my man Jerry in the OT." (i know He would not say it this way)
Us:"Awesome, what about the penalties and late fees, what about those.”
Yah:” Well, you are not qualified to pay those, but I have the PERFECT THING for that.”
Us:”thanks, what is in this NEW one?”
Yah:”the same as the old one….”
Us:”why does it have the same stuff in it if it is NEW?”
Yah:”Because you broke the one I gave you, I said NEW, not DIFFERENT.”
Us:”what if we break this one?”
Yah:”you won’t, I am giving you a personal copy, to carry with you, not on stone, but inside you.”
Us:”that is soooooo smart! We love this!”
Yah:”Uh…I am the Yah…I invented smart. You would not know what smart was if it were not for me. Now if you love me, keep my commands.”
I had a bank loan, it was a "covenant" with the lender to pay an amount every month, to live the loan according to the agreed upon terms. When the economy tanked, I fell farther and farther behind in the payments, until I had to give up the property. Fortunately for me, the bank was merciful (read this as “did not want my building in this economy”) and called me and said that they would forgive the past late payments, refinance the building at a lower interest rate, as long as I paid the back interest. The building is the same, the lender, the borrower, the length of the loan, everything is almost exactly the same, but it is still considered a NEW contract, covenant, agreement, with one small change, the interest rate, and the forgiveness of transgression, the past due amount, because I BROKE the old agreement. I could not pay it, not with the economy as it is. So my views are in line with my understanding of the Hebrews passage, the covenant has the same essence, but written on the hearts, and not on stone. I will bow out now before the usual fireworks regarding what has been fulfilled by the Messiah and is no longer required due to it being fulfilled, and what is still required due to not being fulfilled.
Please let us not go near the Sabbath or those arguments.