teach

Leviticus 10:10
And that ye may put difference between holy and unholy, and between unclean and clean;

Jeremiah 15:19
Therefore thus saith the LORD, If thou return, then will I bring thee again, and thou shalt stand before me: and if thou take forth the precious from the vile, thou shalt be as my mouth: let them return unto thee; but return not thou unto them.

Ezekiel 44:23
And they shall teach my people the difference between the holy and profane, and cause them to discern between the unclean and the clean.

this is

Deuteronomy 24:8
Take heed in the plague of leprosy, that thou observe diligently, and do according to all that the priests the Levites shall teach you: as I commanded them, so ye shall observe to do.