International Standard Version "They are to teach my people how to discern what is holy in contrast to what is common, showing them how to discern between what is unclean and clean.
American Standard Version And they shall teach my people the difference between the holy and the common, and cause them to discern between the unclean and the clean.
Young's Literal Translation 'And My people they direct between holy and common, and between unclean and clean they cause them to discern.