That they separate themselves, to wit, when any uncleanness is upon them, as it appears from Leviticus 22:3,4. From the holy things, i.e. from eating of those parts of the offerings which belong to them. Only of the tithes they might eat in that case. Which they hallow; either the children of Israel, or the priests; for both of them did in their kinds hallow, consecrate, or offer them to God. But the former seems more probable, both because they were mentioned here and Leviticus 22:3, where they are said to hallow, &c., and because this makes the argument stronger, it ill became the priests to profane or pollute what the people did hallow.
Related Commentaries of Leviticus 22:2
Leviticus 22:2
2 Speak unto Aaron and to his sons, that they separate themselves from the holy things of the children of Israel, and that they profane not my holy name in those things which they hallow unto me: I am the LORD.