Read the series.
Let me begin with a statement that will have to be defended, but which I think is difficult to argue against:
Nowhere does the OT tell us that the New covenant is only intended for Israel.
To that someone might (and will) very well direct my attention to Jeremiah 31:31-34 and its repetition in Hebrews 8:8-12. But that will not suffice. The context of the Jeremiah quote comes within what is known as “the Book of Consolation”, which extends from Jeremiah 30 to Jeremiah…