Now it came to pass, when Sanballat heard, etc. Clearly, this is the anger of the heretics, these are their words, who vainly call themselves Samaritans, that is, guardians of God's law, when they are in fact greatly opposed to God and His laws, as they have long been separated from the house of David, that is, from the unity of Christ and the Church through heresies or schisms, or wicked deeds; who fear that their own impiety might be attacked and excluded, and therefore dread the building of the walls of faith. This is the derision of all who say they know God but deny Him by their deeds. For the Samaritans served the Lord in such a way that they did not renounce their ancient gods. Today, those who imitate them typologically are those who are Christians in such a way that they also consider their belly as their god, follow greed, which the Apostle clearly calls the service of idols; and being enslaved by the other allurements of the world, they serve the creature more than the Creator, who is blessed forever. And therefore, such people, like the heretics, do not want the walls of the Church to be renewed, lest, as the state of piety grows, they are forced to abandon their impiety. Such people are accustomed to call the Jews weak, that is, confessors of the faith, and easily vanquished by the nations, while in the daily contest for souls they prefer to embrace vices rather than to obtain the palm of victory through virtue. And because there are some among the heretics who even deny forgiveness to those who repent after falling, it is rightly added in the person of these:
Source: Commentary on Ezra and Nehemiah