1)
Why are the Nesi'im referred to as "Keri'ei ha'Eidah"?
1.
Rashi: Because they were called upon to tend to all communal matters (that concerned their tribe).
Why are the Nesi'im referred to as "Keri'ei ha'Eidah"?
Rashi: Because they were called upon to tend to all communal matters (that concerned their tribe).