Cyrill of Alexandria
After the Israelites had just departed from the Chaldean land and been liberated from oppression, when they returned to Judah and arrived in Jerusalem, they ought to have turned away from their past transgressions. They should have sought a more righteous way of living to atone for their former misdeeds, aiming to please their Redeemer through actions that would bring Him delight. However, they repeatedly transgressed the divine law with the same disregard as before. While Moses instructed them to refrain from marrying foreign women, they ignored this divine command and took as wives the daughters of neighboring nations, thereby creating a lineage that was unclean and estranged from God. Even some of the most esteemed among them fell into such sin.
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Ezra grieved over this, and he went to the house of God in prayer for those who had sinned.
The Jews displayed an inclination towards foreign women, despite the clear admonition found in the law: "Thou shalt not give thy daughter to his son, neither shalt thou take his daughter for thy son: for they will turn away thy son from following me, that they may serve other gods" (Deuteronomy 7:3-4). There is an extensive discussion of this matter in the writings of Ezra, which has led some to mistakenly equate Ezra with Malachi, although they are distinct individuals. An ancient Jewish tradition, noted in the Targum on Malachi, refers to the prophecy of the Lord through "Malachi, who is called by the name of Ezra the scribe," a view supported by early scholars such as Jerome and Augustine.
It has been noted that following their return from Babylon and the land of the Assyrians, the Israelites, showing little regard for divine commandments, began to marry foreign wives. This led to a situation where even the priests were led astray, treating their Israelite concubines with disrespect and sending them away, instead choosing to marry women from foreign nations, such as the Ammonites and Idumeans. The resulting defilement of Israel was significant. These foreign women did not abandon their idolatrous practices, continuing to serve other gods, and it was nearly inevitable that those who united with these corrupt partners would defile themselves and provoke the Lord.
The Lord of all called them to account for their disdain for the wives from Israel or Judah and for their sinful union with foreign daughters, a union which the law expressly forbade. Yet, it is unclear how they could overlook such a noble commandment—perhaps they were entranced by the beauty of these foreign women, succumbing to unrestrained desires, or perhaps they sought to cultivate friendships with these nations to avoid conflicts, as they were already on amicable terms and connected through marriage. Ultimately, this was an affront to God, revealing a lack of faith, as He would not deliver them from their adversaries nor grant them victory over the hostility of the foreign peoples.