64 These searched for their family records, but they could not find them and so were excluded from the priesthood as unclean.

Read Nehemiah 7:64 Using Other Translations

These sought their register among those that were reckoned by genealogy, but it was not found: therefore were they, as polluted, put from the priesthood.
These sought their registration among those enrolled in the genealogies, but it was not found there, so they were excluded from the priesthood as unclean.
They searched for their names in the genealogical records, but they were not found, so they were disqualified from serving as priests.