Ezra 2:61

61 The following priestly clans could find no record to prove their ancestry: Habaiah, Hakkoz, and Barzillai. (The ancestor of the priestly clan of Barzillai had married a woman from the clan of Barzillai of Gilead and had taken the name of his father-in-law's clan.)

Ezra 2:61 Meaning and Commentary

Ezra 2:61

And of the children of the priests
Who could not make out their pedigree, for those that could are mentioned before:

the children of Habaiah, the children of Koz, the children of
Barzillai;
how the latter came by this name follows:

which took a wife of the daughters of Barzillai the Gileadite, and was
called after their name;
this man married a woman that descended from the famous Barzillai the Gileadite, in the times of David; and the priesthood being in disuse, and mean and despicable, in Babylon, he chose to take the name of his wife's family, and pass for a descendant from that, and perhaps destroyed, or at least neglected, to take care of the genealogy of his own family.

Ezra 2:61 In-Context

59 There were 652 belonging to the clans of Delaiah, Tobiah, and Nekoda who returned from the towns of Tel Melah, Tel Harsha, Cherub, Addan, and Immer;

60 but they could not prove that they were descendants of Israelites.

61 The following priestly clans could find no record to prove their ancestry: Habaiah, Hakkoz, and Barzillai. (The ancestor of the priestly clan of Barzillai had married a woman from the clan of Barzillai of Gilead and had taken the name of his father-in-law's clan.)

62 Since they were unable to prove who their ancestors were, they were not accepted as priests.

63 The Jewish governor told them that they could not eat the food offered to God until there was a priest who could use the Urim and Thummim.