The new covenant is named in contrast to the old, mosaic covenant. All of Israel, including permanent residents were to obey, benefit from the old covenant.
wi has developed the strange idea that only the priests and kings are in the new covenant, not everyone.
Strange that the 144 000 partakers, royals and priest all, "come out of the 12 tribes of Israel [of god] "
"spiritual" Israel is clearly bigger than just the partakers. the anointed, chosen, sealed are in the kingdom covenant, all the tribes, all the members are in the new covenant.
The New covenant leads to everlasting life, being king, priest with Christ means more, immortality, but
Everlasting life, when sacrificed, leads to immortality. You have to partake to get everlasting life, whether you live it or lose it by the ax, Rev.20.
It is enlightening to have the heavy burden of mixed up wt doctrine removed from one's load,