Doing some reading before bed, and noticed something for which there must be an easy answer. In Numbers 4 it mentions several times that those who serve in the Tent of Meeting were to be aged 30 to 50, but in 8:24 it says those who serve were to be 25 to 30. How much time passed between chapters 4 and 8? I don't have my old Scofield handy with the dates at the top of each page. Why the difference? Anyone have a good commentary handy?