At a parshat hashavua shiur that I regularly attend, the rabbi has stated on multiple occasions that the bechorot (firstborn sons of Israel) were supposed to serve the purpose that the Leviim and ...
The Ramban and Rashi disagree when the Mishkan was commanded to be built. Either before or after the Egel HaZahav respectively. Can you provide SOURCES that are able to reconcile their differences? ...