The leaders report that the people 'have not kept themselves separate from the surrounding peoples whose abominations are like those of the Canaanites' (9:1), naming Canaanites, Hittites, and the rest of the old list, and the assembly resolves 'to send away all the foreign wives and their children' (10:3). The covenant ground is stated in the law the report echoes: Israel was not to intermarry with those nations because 'they will turn your sons away from following Me to serve other gods' (Deuteronomy 7:3-4). The danger was worship, not ancestry, and the same book seats at the passover 'all who had separated themselves from the uncleanness of the peoples of the land to seek the LORD' (6:21), which is a door held open to outsiders who came in. The severity is real and the text does not soften it: households were broken, and chapter 10 ends with a list of names and the flat sentence 'All these men had married foreign women, and some of them had children by these wives' (10:44). Readers have long weighed the account differently, and the readings are given below. This page draws no verdict on it, and nothing in these chapters is a text about Jewish people to be used against them; it is a record of one community's crisis, kept in that community's own Scripture.
A necessary covenant measure for that moment
held by Derek Kidner (Ezra and Nehemiah, Tyndale Old Testament Commentaries, 1979) and the traditional reading, which holds that a remnant of a few thousand around one altar would have dissolved into the surrounding cults within a generation, and that Nehemiah faced the same drift and named the same danger (Nehemiah 13:23-25)
The text reports the measure without the narrative endorsing every part of it
held by H. G. M. Williamson (Ezra, Nehemiah, Word Biblical Commentary, 1985) and Joseph Blenkinsopp (Ezra-Nehemiah, Old Testament Library, 1988), who both observe that the proposal comes from Shecaniah and the assembly rather than from a recorded command of God, and that Malachi, preaching in the same period, says 'For I hate divorce, says the LORD' (Malachi 2:16)