Isaiah 26:1

In that day shall this song be sung -By the people of God, on their restoration to their own land. We have a strong city -Jerusalem. This does not mean that it was then strongly fortified, but that God would guard it, and that thus it would be strong. Jerusalem was easily capable of being strongly fortifiedPsalms 25:2; but the idea here is, that Yahweh would be a protector, and that this would constitute its strength. Salvation will God appoint for walls -That is, he will himself be the defender of his people in the place of walls and bulwarks. A similar expression occurs inIsaiah 60:18(see alsoJeremiah 3:23, andZechariah 2:5). Bulwarks -This word means properly bastions, or ramparts.