Whenever the phrase “twelve tribes” is used in scripture, it is always a reference to the whole nation - Genesis 49:28, Exodus 24:4, 28:21, Ezekiel 47:13.
The NT is no exception- Matthew 19:28, Luke 22:30, Acts 22:7, Revelation 21:12.
Whenever Christians out of the twelve tribes are referred to, they are clearly designated apart from the 12 tribes. Saved Jews are referred to as the remnant (Romans 9:27, 11:5); the Israel of God (Galatians 6:16); believing Jews (Romans 1:16); etc...
The NT is no exception- Matthew 19:28, Luke 22:30, Acts 22:7, Revelation 21:12.
Whenever Christians out of the twelve tribes are referred to, they are clearly designated apart from the 12 tribes. Saved Jews are referred to as the remnant (Romans 9:27, 11:5); the Israel of God (Galatians 6:16); believing Jews (Romans 1:16); etc...