Ezekiel 44:20-24

Also they shall not shave their heads, yet they shall not let their locks grow long; they shall only trim the hair of their heads.

Nor shall any of the priests drink wine when they enter the inner courtyard.

And they shall not marry a widow or a divorced woman, but shall take virgins from the descendants of the house of Israel, or a widow who is the widow of a priest.

Moreover, they shall teach My people the difference between the holy and the common, and teach them to distinguish between the unclean and the clean.

In a dispute they shall take their stand to judge; they shall judge it according to My ordinances. They shall also keep My laws and My statutes in all My appointed feasts, and sanctify My Sabbaths.