Adam Clarke Bible Commentary

For every meat-offering for the priest shall be wholly burnt - Whatever the priest offered was wholly the Lord's, and therefore must be entirely consumed: the sacrifices of the common people were offered to the Lord, but the priests partook of them; and thus they who ministered at the altar were fed by the altar. Had the priests been permitted to live on their own offerings as they did on those of the people, it would have been as if they had offered nothing, as they would have taken again to themselves what they appeared to give unto the Lord. Theodoret says that this marked "the high perfection which God required in the ministers of his sanctuary," as his not eating of his own sin-offering supposes him to stand free from all sin; but a better reason is given by Mr. Ainsworth: "The people's meat-offering was eaten by the priests that made atonement for them, Lev 6:15, Lev 6:16, Lev 7:7; but because no priest, being a sinner, could make atonement for himself, therefore his meat-offering might not be eaten, but all burnt on the altar, to teach him to expect salvation, not by his legal service or works, but by Christ; for the eating of the sin-offering figured the bearing of the sinner's iniquity;" Lev 10:17.