to distinguish between sacred and profane, and between clean and unclean,

Therefore thus says the Lord: If you will return, then will I restore you, and you shall stand before My face. And if you will bring forth the precious from the worthless, you shall be as My mouth; and they shall return to you; but you shall not return to them.

And they shall teach My people [to distinguish] between holy and profane, and they shall make known to them [the difference] between unclean and clean.

Take heed to yourself [regarding] the plague of leprosy: you shall take great heed to do according to all the law, which the priests, the Levites, shall report to you; take heed to do, as I have commanded you.