John Gill Commentary Nehemiah 3:16

"After him repaired Nehemiah the son of Azbuk, the ruler of half the district of Beth-zur, unto the place over against the sepulchres of David, and unto the pool that was made, and unto the house of the mighty men." — Nehemiah 3:16 (ASV)

After him repaired Nehemiah the son of Azbuk, the ruler of the
half part of Bethzur .
A strong fortified place in the tribe of Judah, (Joshua 15:58) ,

unto the place over against the sepulchres of David ;
where he and his family, and the kings of his race, were buried, which remained to this time untouched by the Babylonians, and to many ages after; see (Acts 2:29)

and to the pool that was made ;
not a natural, but an artificial one, which was made by Hezekiah, (2 Kings 20:20) ,

and unto the house of the mighty ;
where was a garrison of soldiers in former time for defence.