Leviticus 14:57
to teach when something is unclean and when it is clean. This is the law for dealing with infectious disease."
Leviticus 10:10
as well as to distinguish between the holy and the common, and between the unclean and the clean,
Deuteronomy 24:8
Be careful during an outbreak of leprosy to follow precisely all that the Levitical priests instruct you; as I have commanded them, so you should do.
Jeremiah 15:19
Because of this, the Lord said, "You must repent of such words and thoughts! If you do, I will restore you to the privilege of serving me. If you say what is worthwhile instead of what is worthless, I will again allow you to be my spokesman. They must become as you have been. You must not become like them.
Ezekiel 44:23
Moreover, they will teach my people the difference between the holy and the common, and show them how to distinguish between the ceremonially unclean and the clean.