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."
Cross References (ranked by relevance)
Her priests have violated my law, and have profaned mine holy things: they have put no difference between the holy and profane, neither have they shewed difference between the unclean and the clean, and have hid their eyes from my sabbaths, and I am profaned among them.
My people are destroyed for lack of knowledge: because thou hast rejected knowledge, I will also reject thee, that thou shalt be no priest to me: seeing thou hast forgotten the law of thy God, I will also forget thy children.
Her prophets are light and treacherous persons: her priests have polluted the sanctuary, they have done violence to the law.
They shall teach Jacob thy judgments, and Israel thy law: they shall put incense before thee, and whole burnt sacrifice upon thine altar.