Tithes & Offerings
We would do well to correct an error mistakenly held by many who believe that a blessed objet may not be sold from one person to another. The Church does not forbid the selling of already-blessed objects. Rather, what she forbids is the selling of the blessing itself. It would be a sin, for example, to sell an object which has been blessed for more money than if were not blessed – however, a priest can very well bless religious items in advance, and then put them up for sale for the same price as it they were not yet blessed. In this case, what is being sold is not the blessing, but rather the object itself; the blessing in no way affects the price of the object concerned.
The other tribes, by their material offerings, were thus to provide for the material needs of this priestly class, whose sole task it was “to stand before the Lord God” (Deuteronomy XVIII, 7), “…serving Him in the tabernacle and bearing the sins of the people” (Numbers XVIII, 23).