Albert Barnes Commentary Nehemiah 3:6

"And the old gate repaired Joiada the son of Paseah and Meshullam the son of Besodeiah; they laid the beams thereof, and set up the doors thereof, and the bolts thereof, and the bars thereof." — Nehemiah 3:6 (ASV)

The old gate — Either the modern Damascus gate, the main entrance to the city on the north side; or a gate a little further eastward.