Separate themselves from the holy things of the children of Israel. — As parts of the sacrifices offered by the Israelites belonged to the priests, they are here warned that (see Leviticus 7:20-21) they are not to consider themselves absolutely entitled to them under all circumstances, and that there are times when they must abstain from them.
In those things which they hallow unto me. — That is, in their treatment of the sacrifices which the children of Israel have consecrated and offered to the Lord.