The nobles of Judah sent many letters unto Tobiah Corresponding with him against Nehemiah, and against their own city and nation. So that, added to all the other wickedness of this people, there were false brethren among their great men, who favoured, aided, and abetted the designs of their enemies, Nehemiah 6:18. There were many in Judah sworn unto him To be true to him in the prosecution of his wicked designs. Because his son had taken the daughter of Meshullam This is mentioned to show the mischief of such unequal and forbidden marriages, and how reasonable and necessary Ezra's action was in the dissolution of them.
Related Commentaries of Nehemiah 6:17
Nehemiah 6:17-18
17 Moreover in those days the nobles of Judah sentb many letters unto Tobiah, and the letters of Tobiah came unto them.
18 For there were many in Judah sworn unto him, because he was the son in law of Shechaniah the son of Arah; and his son Johanan had taken the daughter of Meshullam the son of Berechiah.