Paul speaks of those who are given the covenant being “grafted into the cultivated olive tree.” Olives produce oil, and that oil is a symbol of the Holy Spirit. The tree into which the Gentiles were grafted is that which reproduces the oil that symbolizes the Holy Spirit. So, that olive tree represents the family of Yah—those with the Spirit of Yah.
To that family, the Father gave a sign—a coat of arms, as it were. In Ezekiel 20, Yah tells His children that He gave His Sabbaths to them as a sign, as family identification. The Sabbaths include the seventh day of each week, and the Father’s seven ordained feasts (Passover, Unleavened Bread, Firstfruits, Weeks, Trumpets, Atonement, and Tabernacles).
Christianity came along after all the NT writers had died, and because of intense hatred of the Jews, that sign from the Father was rejected and outlawed, and what was codified as the law of the land was the embrace of counterfeit days—pagan traditions of men that attempt to supplant the true ordained days of the Father.
The counterfeit became so established, that christians today look at the true family sign, and claim that such things are “Old Testament,” or “under the law,” or “given only to the Jews.” Now, the first two claims are borne of spiritual ignorance (which pervades christianity), but the third is actually correct. Those things ARE given only to the Jews.
The problem is that so many think the Jews are the physical Israelites of the Old Testament. They were only a physical foreshadow of the true Jews. The true Jews are described in Romans 2:29, and it has nothing to do with anything physical. It is those who are given the covenant—the seal of the Holy Spirit. Galatians 3:28-29 shows us who the real substance of Abraham’s descendants are—those who are given the Holy Spirit.
So, how can it be thought that those who wholly reject everything about Yah’s true family have actually been grafted into the family tree? The counterfeit is not the tree, but an artificial knockoff of the tree. The counterfeit is man’s attempt to mimic the tree without actually possessing its true qualities. To identify with that counterfeit tree is to reject the true family tree.
For more information: What Are the Old and New Covenants?