Ezra 2:61-63

and of the sons of the priests: the sons of Habaiah, the sons of Koz, and the sons of Barzillai, who took a wife of the daughters of Barzillai the Gileadite, and was called by their name. These sought their listing among those who were registered by genealogy, but they were not found; therefore they were excluded from the priesthood as defiled. And the governor said to them that they should not eat of the most holy things till a priest could consult with the Urim and Thummim.