In chapter 3 we watch as the Leviim are consecrated, and assigned roles in transporting the Sanctuary in their family clans - Gershon, Kehat and Merari. The Levites are also redeemed or exchanged with the Firstborn.
But why were the Levites given this special role? Why are we seeing this role only now? And in what way do the Levites interplay with the firstborn?