Ezekiel 44:22-26

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.

They shall not go to a dead person to defile themselves; however, for father, for mother, for son, for daughter, for brother, or for a sister who has not had a husband, they may defile themselves.

And after he is cleansed, seven days shall elapse for him.