And that they should keep the charge of the tabernacle of the congregation, and the charge of the holy place, and the charge of the sons of Aaron their brethren, in the service of the house of the LORD. The charge of the sons of Aaron - It was the priests' business to kill, flay, and dress, as well as to offer, the victims, but being few, they were obliged to employ the Levites to flay those animals. The Levites were, properly speaking, servants to the priests, and were employed about the more servile part of Divine worship.
Commentary on the Bible, by Adam Clarke [1831].