New Testament doctrine is the same thing as Old Testament doctrine. The main difference is in the depth of explanation and clarity due to progressive revelation.
Any New Testament doctrine can be seen, at least in shadow, in the OT. This is particularly true of the “big” doctrines, things like sin and grace and forgiveness and salvation.
Here are two verses that my mind recently linked together:
Both verses are saying the same thing. Sacrifices for Israel were never intended to be license to sin. “Hey, I got plenty of rams to kill, let’s party in sin!”
Nor are we, after Christ’s sacrifice, to think, “Hey, I got Christ’s perfect sacrifice, let’s party in sin!”
However, many people in Israel did view sacrifices like this, “To what purpose is the multitude of your sacrifices unto me? saith the LORD: I am full of the burnt offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he goats.”
Israel was sacrificing all kinds of animals but God was not pleased with dead animals, He wanted them to knock off the sin. These sacrifices were a type of Christ.
It should not surprise us that many view Christ’s sacrifice just as flippantly. People have been doing that for thousands of years. Israel was judged because of this, wonder if God still feels the same way?
“For if God spared not the natural branches, take heed lest he also spare not thee.”