Hebrews 8:5 - They serve at a sanctuary that is a copy and shadow of what is in heaven. This is why Moses was warned when he was about to build the tabernacle: "See to it that you make everything according to the pattern shown you on the mountain."
The Old Testament is a pre-revelation leading to the revealing of our Messiah Christ Jesus. All it's history, good and bad.

The verse above mention this key word, copy and shadow of what is in heaven, meaning it was only a temporal way to God, not the real thing.

That is why there is problem in reaching to God using the OT way which is self effort akin to self righteousness, resulting in death.

Lol ... too much time spent on enterprise support aren't you?

It is not like Nostradamus' writing ... not trying to be cryptic for the sake of being cryptic.

What is in the Old Testament is a typology, a set of types. Then what is in the New Testament is a complete fulfillment of that typology concerning God’s purpose.

It's just like a book ... you need pictures [which is like a picture is worth a thousand words] and the definitions, explanation etc.

Thus, the entire Bible, both the Old Testament and the New Testament, is first a picture of God’s purpose and then a full definition and fulfillment of God’s purpose.

On the one hand, if we want to know the Old Testament, we must come to the New Testament definition. In the Old Testament, we can see only the pictures. On the other hand, if we want to know the New Testament, we have to spend the time to look at all these pictures.

So, the Old Testament presents a figurative portrait of God’s eternal purpose spanning thirty-nine books, but it is only in four sections—in types, in history, in poetry, and in prophecy.