Hopefully for the ones who have been reading the Give God 90 posts this will bring some things together...
It is important to understand the Levitical priesthood was established as a result of the worship of the golden calf. prior to that there was no need because everyone was to be considered a priest, a representative of the Creator on earth. However because our Creator chose to plague the people with a constant reminder they had violated the covenant, the Levites were placed in charge of overseeing that plague carried out.