Ezra 2:61-63

Also these priests: the descendants of Hobaiah, Hakkoz, and Barzillai, who had married a daughter of Barzillai from Gilead and was called by her family name. These people searched for their family records but could not find them. So they could not be priests, because they were thought to be unclean. The governor ordered them not to eat any of the food offered to God until a priest had settled this matter by using the Urim and Thummim.