Ezekiel 44:21-23

44:21 No priest may drink wine when he enters the inner court. 44:22 They must not marry a widow or a divorcee, but they may marry a virgin from the house of Israel or a widow who is a priest’s widow. 44:23 Moreover, they will teach my people the difference between the holy and the common, and show them how to distinguish between the ceremonially unclean and the clean.