Of every clean animal you shall take with you seven pair, the male and his female, and of animals that are not clean, two each the male and his female; [Lev 11:1-13]
The priests shall teach My people the difference between the holy and the common, and teach them to distinguish between the (ceremonially) unclean and the clean.
and to make a distinction and recognize a difference between the holy (sacred) and the common (profane), and between the [ceremonially] unclean and the clean; [Ezek 44:23]