Rev. 7: the 144 000 (wt partakers all), "come out of the 12 tribes of Israel." All members of the 12 tribes are in the covenants, mosaic and "new". They are not strangers. The 12 tribes are the majority, not the minority of believers.
This "stranger, Jonadab' doctrine " is a wrong, strange wt teachings about excluded "strangers". 100 year old old light of abstention from the emblems.
The wt anointed, are in the "kingdom covenant", all christians ( members of the 12 tribe "Israel of God" ) are in the new covenant which is basically for "forgiveness of sin". .