Leviticus 14:57
To make clear when it is unclean and when it is clean: this is the law about the disease of the leper.
Leviticus 10:10
And make a division between the holy and the common, and between the unclean and the clean;
Deuteronomy 24:8
In connection with the leper's disease, take care to keep and do every detail of the teaching of the priests, the Levites: as I gave them orders, so you are to do.
Jeremiah 15:19
For this cause the Lord has said, If you will come back, then I will again let you take your place before me; and if you give out what is of value and not that which has no value, you will be as my mouth: let them come back to you, but do not go back to them.
Ezekiel 44:23
And they are to make clear to my people the division between what is holy and what is common, and to give them the knowledge of what is clean and what is unclean.