Numbers 8:19

To do the service of Israel To serve God in their stead; to do what otherwise they would have been obliged to do in their own persons. To make an atonement Not by offering sacrifices, which the priests alone might do, but by assisting the priest in that expiatory work, and by a diligent performance of all the parts of their office, whereby God was pleased both with them and with the people. That there be no plague This is added as a reason why God appointed them to serve in the tabernacle, that they might guard it, and not suffer any of the people to come near it, or meddle with holy things; which if they did, it would certainly bring a plague upon them.