Leviticus 14:57
to teach when it is unclean and when it is clean. This is the law of leprosy.
Leviticus 10:10
Even for a distinction between the holy and unholy, and between the unclean and clean
Deuteronomy 24:8
Be careful in the plague of leprosy, that you watch carefully and do according to all that the priests the Levites shall teach you. As I commanded them, you shall be careful to do.
Jeremiah 15:19
Therefore so says Jehovah, If you turn back, then I will bring you again; you shall stand before Me. And if you take the precious from the worthless, you shall be as My mouth. Let them turn back to you, but do not return to them.
Ezekiel 44:23
And they shall teach My people to discern between the holy and common, and between the unclean and the clean.