Leviticus 14:57
to teach when it is unclean and when it is clean: this is the law of leprosy.
Leviticus 10:10
and this is that ye may discern between the holy and the profane and between the unclean and the clean
Deuteronomy 24:8
Keep yourselves from 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 take care to do.
Jeremiah 15:19
Therefore thus hath the LORD said, If thou wilt return, then I will bring thee again, and thou shalt stand before me; and if thou wilt 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 teach them to discern between the clean and the unclean.