Ezra 2:59

And these were they which went up from Tel–melah, Tel–harsa, Cherub, Addan, and Immer: but they could not shew their father’s house, and their seed, whether they were of Israel:

Cross-reference

Nehemiah 7:61 is a parallel account with identical wording, listing those who could not prove their Israelite descent.

Ezekiel 13:9 speaks of being enrolled in Israel's register, directly relevant to those who cannot prove lineage here.

1 Chronicles 9:1 mentions Israel enrolled by genealogies, providing background for the genealogical issue in this verse.