Bede

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. …

Commentary on Ezra and Nehemiah ↗