Ezra 2:62

“These sought their register among those that were reckoned by genealogy, etc.] To find their names written and registered there; for the Jews kept public registers of their priests, their descent, marriages, and offspring, that it might be known who were fit, and who not, to officiate as such: but they were not found; their names were not there, nor any account taken of them: therefore were they, as polluted, put from the priesthood; were not suffered to attend at the altar, and offer sacrifice, and enjoy the privileges belonging to that office.”

“Genealogy - The Jews were generally very exact in their genealogies from their own choice and interest, that they might preserve the distinctions of the several tribes and families, which was necessary both to make out their titles to offices or inheritances, and to govern themselves thereby in the matter of marriages, and from the special providence of God, that so it might be certainly known of what tribe and family the Messiah was born. Ezra 2:63”

“therefore: Lev 21:21-23; Num 3:10, Num 16:40, Num 18:7 were they, as polluted, put from the priesthood: Heb. they were polluted from the priesthood, Eze 44:10-14 Ezra 2:63”