Ruler of the half part of Jerusalem - Probably the city was divided into two parts; one for Judah, and the other for Benjamin, each having its proper governor. Rephaiah mentioned here was one of these governors, and Shallum, mentioned Nehemiah 3:12, was the other. There were other rulers or governors of particular country or village districts.

And next unto them repaired Rephaiah, the son of Hur, the ruler of the half part of Jerusalem. That city belonging partly to the tribe of Judah, and partly to the tribe of Benjamin; one part of it was under a governor that was of the tribe of Judah, as this man seems to be; and the other part under one of the tribe of Benjamin; see Nehemiah 3:12.

Further lengths of wall were built by Rephaiah ben Hur, the ruler of the half district of Jerusalem, i.e., of the district of country belonging to Jerusalem (comp. Nehemiah 3:19 with Nehemiah 3:15, where Mizpah and the district of Mizpah are distinguished); by Jedaiah ben Harumaph, בּיתו ונגד, and indeed before (opposite) his house, i.e., the portion of wall which lay opposite his own dwelling; and by Hattush the son of Hashabniah. Whether Hattush is to be identified with the priest of this name (Nehemiah 10:5), or with the similarly named descendant of David (Ezra 8:2), or with neither, cannot be determined.

And next unto them repaired Rephaiah the son of Hur, the ruler of the half part of Jerusalem.

3:9 Half part - As Rome was anciently divided into several quarters or regions, so was Jerusalem; and especially into two parts, whereof one was in the tribe of Benjamin, and nearest the temple, the other in the tribe of Judah, these accordingly had two several rulers, this man and the other, ver.12, but both under the chief governor of the city.

3:1-32 The rebuilding the walls of Jerusalem. - The work was divided, so that every one might know what he had to do, and mind it, with a desire to excel; yet without contention, or separate interests. No strife appears among them, but which should do most for the public good. Every Israelite should lend a hand toward the building up of Jerusalem. Let not nobles think any thing below them, by which they may advance the good of their country. Even some females helped forward the work. Some repaired over against their houses, and one repaired over against his chamber. When a general good work is to be done, each should apply himself to that part which is within his reach. If every one will sweep before his own door, the street will be clean; if every one will mend one, we shall all be mended. Some that had first done helped their fellows. The walls of Jerusalem, in heaps of rubbish, represent the desperate state of the world around, while the number and malice of those who hindered the building, give some faint idea of the enemies we have to contend with, while executing the work of God. Every one must begin at home; for it is by getting the work of God advanced in our own souls that we shall best contribute to the good of the church of Christ. May the Lord thus stir up the hearts of his people, to lay aside their petty disputes, and to disregard their worldly interests, compared with building the walls of Jerusalem, and defending the cause of truth and godliness against the assaults of avowed enemies.