isaiah 26:1 In that day shall this song be sung in the land of Judah; We have a strong city; salvation will God appoint for walls and bulwarks. - Free Bible Online

      Isa 26:1-21. CONNECTED WITH THE TWENTY-FOURTH AND TWENTY-FIFTH CHAPTERS. SONG OF PRAISE OF ISRAEL AFTER BEING RESTORED TO THEIR OWN LAND.

      As the overthrow of the apostate faction is described in the twenty-fifth chapter, so the peace of the faithful is here described under the image of a well-fortified city.

      1. strong city--Jerusalem, strong in Jehovah's protection: type of the new Jerusalem (Ps 48:1-3), contrasted with the overthrow of the ungodly foe (Isa 26:4-7, 12-14; Re 22:2, 10-12, &c.).
      salvation . . . walls-- (Isa 60:18; Jer 3:23; Zec 2:5). MAURER translates, "Jehovah makes His help serve as walls" (Isa 33:20, 21, &c.).
      bulwarks--the trench with the antemural earthworks exterior to the wall.

JFB.