Patristic A.D. 420
“(Chapter 26, Verse 1) On that day, this song will be sung in the land of Judah: Our strong city, the Savior will set it as a wall and rampart. In that day, this song will be sung over the land of Judah: Behold, a strong city, our salvation will set up walls and bulwarks. When Moab is humbled and brought to the ground, and all the enemies of Christ are brought low, then this song will be sung in the land of Judah or Judea, which signifies both confession: that just as we have understood Zion and Jerusalem to be the heavenly city, so let us understand the confession of this city's region to be a heavenly confession. Finally, the saints unwilling to sing the song of Judah in a foreign land, say: How can we sing the Lord's song in a foreign land? (Ps. 136:4). I think this is the song that is also commanded to the saints in another place: Sing to the Lord a new song (Ps. 95:1). And this song will be the one that follows: The city of our strength is the Savior (Matthew 5). What city is this? It cannot be hidden, for it is situated on a mountain. It is written about this in another place: The rushing of the river makes glad the city of God (Psalm 46:4); and again: Glorious things are spoken of you, O city of God (Psalm 87:2). The founder of this city is the one about whom the Father speaks: he built my city. Indeed, the Savior is the city of our strength, that is, Jesus. And in it will be placed a wall and a bulwark. The wall of good works, and the bulwark of right faith, so that it may be protected on both sides by a double defense. For it is not enough to have a wall of faith, unless that faith is confirmed by good works. This wall and this rampart or surrounding wall are built of living stones, which, according to the prophet, are rolled upon the earth. The term we render 'rampart' Symmachus has interpreted 'firmament,' so that the walls themselves may be surrounded by fortifications and ramparts and trenches and other walls, which in the construction of camps they are accustomed to call breastworks.”
Historical Christian Faith commentaries database, on Isa 26:1 (Commentary on Isaiah)
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