Ezra 2:59

Some returnees believed in Israel's God but lacked genealogical records to prove they were Israelites. Without this information, the other Israelites were unsure whether to treat them as family and intermarry with them or as outsiders. The genealogies in 1 Chronicles 1–9 show how carefully many families kept their histories.

This chapter is Ezra's first major digression from the main story. The returning exiles needed to identify true Jews to maintain their community identity and theological purity. This helped them know whom they could marry and who could worship at the temple. This list is not the initial list of all Jews who returned to Jerusalem (compare Nehemiah 7:6–73). Instead, it is a slightly later list, created after Sheshbazzar died, of people who had settled in their towns.