'Clean and the Unclean' in the Bible

Her priests do violence to My instruction and profane My holy things. They make no distinction between the holy and the common, and they do not explain the difference between the clean and the unclean. They disregard My Sabbaths, and I am profaned among them.

They must teach My people the difference between the holy and the common, and explain to them the difference between the clean and the unclean.