@Dhowjen Paul wrote that Abraham was saved through faith, before the law was even given. So salvation has always been through faith in the messiah. (Romans 4)
The covenant contains special terms into which one was a participant just by being born into the community, but nowhere is eternal salvation granted on that basis alone.
It's always been grace through faith, regardless of which side of the timeline one lives.
Anyone feel free to add or correct if I'm mistaken.
@SecondJon @Dhowjen Good answer.