It is not said they repaired, as was said of the rest, but they fortified it, either because this part of the wall was less demolished than the other, and therefore they needed not to repair it, but only to make it stronger by some additions; or to note their extraordinary care and diligence, that they would not only repair it, and restore it to its former state, but make it stronger than ever it was; which also might be fit to be done in that part of the city. Others render it they left, as this word commonly signifies; and so the meaning is, They omitted the building of that part of the wall, because it remained standing; this being that space of four hundred cubits which was pulled down by Joash king of Israel, and rebuilt by Uzziah, who made it so strong, that the Chaldeans could not pull it down without more trouble than they thought fit to employ about it. But this chapter gives us an account of what they did in the building, not of what they did not, but left as they found it.
Related Commentaries of Nehemiah 3:8
Nehemiah 3:8
8 Next unto him repaired Uzziel the son of Harhaiah, of the goldsmiths. Next unto him also repaired Hananiah the son of one of the apothecaries, and they fortifieda Jerusalem unto the broad wall.