In the previous chapter, the priests have been commanded to avoid occasions of ceremonial defilement, but there are times in which they must be unclean. At these times they are here instructed that they must abstain from their priestly functions, and not even eat of the priests' portions until they have been cleansed.
The command to Aaron and to his sons, that they separate themselves from the holy things of the children of Israel, in Leviticus 22:2, must be read in the light of the following verses, and understood to mean that they are to separate themselves from the holy things when they are unclean.
The different forms of uncleanness which are to produce this effect are enumerated in Leviticus 22:4-6. In most cases the uncleanness would not last beyond sunset on the day on which it was incurred, but occasionally, as when a priest became a leper, a permanent disqualification would be caused, or one that lasted for a considerable length of time.
The law with respect to abstaining from holy things while unclean is to be of permanent obligation. Whoever disobeys it is to be cut off from God's presence; that is, he is to be excluded from the sanctuary by being deprived of his priestly office.
Leviticus 22:8 repeats the prohibition of eating flesh containing blood.