What does Leviticus 22:3 mean?

If a priest has a skin disease or a bodily discharge, he can't eat the sacred food until he's clean. The same goes for anyone who touches something made unclean by a dead body or by another person with an emission. Leviticus 22:3 - Modern Text Bible

(Certain conditions make a priest temporarily unfit to eat the offerings. This is about ritual purity, not moral failure.)