'Difference' in the Bible

Her priests have done violence to My law and have profaned My holy things. They have made no distinction between the holy (sacred) and the profane (secular), they have not taught [people] the difference between the unclean and the clean; and they hide their eyes from My Sabbaths, and I am profaned among them.

The priests shall teach My people the difference between the holy and the common, and teach them to distinguish between the (ceremonially) unclean and the clean.