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1 Now when these things were done, the princes came to me, saying, The people of Israel, and the priests, and the Levites, have not separated themselves from the people of the lands, doing according to their abominations, even of the Canaanites, the Hittites, the Perizzites, the Jebusites, the Ammonites, the Moabites, the Egyptians, and the Amorites.
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[AD 735] Bede on Ezra 9:1
After these things were completed, etc. The guilt of this transgression is also clearly described and reproved by prophetic authority in the prophet Malachi; because evidently those who returned from Babylonian captivity, both princes and priests and Levites, as well as the rest of the people, took wives of Israelite descent, who, suffering from the hardship and infirmity of long life, and the fragility of their sex, had been worn out and contracted weakness and deformity of body, and they married foreign women who were either flourishing in age, or more beautiful in body, or daughters of the powerful and rich. This should be understood not about those who were then with Ezra, but about those who had already ascended from captivity with Zerubbabel and Jeshua; for those who had come with Ezra could hardly have so quickly despised the doctrine of such a great leader and prelate, as it is understood, that after scarcely five months in their homeland, they had left their own wives and taken foreign wives; of whom these princes, who brought this crime to Ezra to be punished, were more likely to have been. Nor is it surprising that the people of Israel, along with priests and Levites, are said to have committed this crime, since that transmigration was more from Judah and Benjamin than from the ten tribes which were called Israel. For it should be known that when Israel, that is, the ten tribes, was taken into captivity, the traditional name was also indiscriminately applied to the two tribes of Judah and Benjamin, calling them Israel. Therefore, the people of Israel in this place is to be understood not in the distinction of Judah and the ten tribes of Benjamin, but in the general distinction of the peoples of the lands, understanding the people of God, who polluted the dignity of their heavenly name with the society of earthly ones. For also the same prophet Malachi, whom the Hebrews assert to be Ezra himself, recalls such transgression in his book of prophecy: "Judah has been unfaithful, an abomination has been committed in Israel and in Jerusalem, because Judah has desecrated the sanctuary of the Lord, which he loves, and married the daughter of a foreign god. May the Lord cut off from the tents of Jacob anyone who does this—an advocate or master and student—even though he brings an offering to the Lord Almighty" (Malachi II). Where, referring to Judah, he clearly indicates that the people of the first transmigration were polluted by this crime. And when he adds, "May the Lord cut off from the tents of Jacob anyone who does this—an advocate or master and student," he taught that both the leaders and the people, polluted by this transgression, and if they do not correct it, should be eradicated from the fellowship of saints. And when he added, "Even though he brings an offering to the Lord Almighty," he warns that they offer sacrifices to the Lord in vain, who do not fear to submit themselves to the devil by sinning. Among these, the admirable faith and excellent purpose of the people freed from captivity, who called other nations the peoples of the lands in distinction to themselves, should be noted, so that they clearly implied that they themselves, although born from the earth, believed they had their conversation not on earth, but in heaven, since they believed in the God of heaven above all other nations and hoped to obtain blessings from Him. From this, they rightly grieved that their sanctification was contaminated by people of the nations; and what is more serious, they confessed that their leaders, from whom they should have been corrected, were the first to err. It should be carefully noted, and taken as an example for conduct, that what the leaders sinned and made the people committed to them sin as well, other leaders who lived more sanctly strive to correct. But because they cannot do it by themselves, they refer the cause to the pontiff, that is, their archbishop, by whose authority such a grave, multifaceted, and long-lasting sin would be expiated. No one doubts that foreign wives figuratively represent heresies and superstitious sects of philosophers. When these are incautiously admitted into the Church, they not only contaminate the holy seed of Catholic truth and pure action with their errors, but also all the sins with which the Gentiles are accustomed to be polluted, while Christians are not ashamed to imitate them, become like foreign wives, degenerating from the holy seed of the word of God, by which they were born, as the apostle James says: "He chose to give us birth through the word of truth" (James I); and as if they produce profane offspring from the daughters of foreigners, while following the attractions of those who go astray, they bring forth perverse acts into the knowledge of everyone.

Source: Commentary on Ezra and Nehemiah
[AD 1781] Richard Challoner on Ezra 9:1
Have not separated themselves: This shows how sinful it is to intermarry with those that the Church forbids us, on account of the danger of perversion and falling off from the true faith.