'Clean and the Unclean' in the Bible

You must distinguish between the holy and the common, and the clean and the unclean,

And you shall distinguish between the clean and the unclean animal and between the unclean and the clean bird; and you shall not defile yourselves with the animal or with the bird or with anything that moves along the ground that I have set apart for you {as unclean}.

However, with all your soul's desire you shall sacrifice and eat flesh in all your gates, according to the blessing of Jehovah your God which He has given you, the clean and the unclean, one may eat, as of the gazelle, and as of the hart.

Indeed, you may eat it as the gazelle and deer are eaten; both the clean and the unclean may eat it.

Everything is the same for everyone: there is one fate for the righteous and the wicked, for the good and the bad, for the clean and the unclean, for the one who sacrifices and the one who does not sacrifice. As it is for the good, so it is for the sinner; as for the one who takes an oath, so for the one who fears an oath.

Its priests treat my law violently, and they profane my holy objects; they do not distinguish between holy object and what is unholy, or between the clean and the unclean. They do not teach the difference, and they hide their eyes from my Sabbaths, and [so] I am profaned in the midst of them.

They must teach My people the difference between the holy and the common, and explain to them the difference between the clean and the unclean.