Questions on reading of the day, Isaiah

3 And he who is left in Zion and remains in Jerusalem will be called holy, every one who has been recorded for life in Jerusalem, 4 when the Lord shall have washed away the filth of the daughters of Zion and cleansed the bloodstains of Jerusalem from its midst by a spirit of judgment and by a spirit of burning.

I have a few questions:
Does” he who is left in Zion and remains in Jerusalem” refer to all the christians that at the end of their life go in Heaven? So is Isaiah talking about Jerusalem- Heaven or the Jerusalem of the earth, the city ?

Who are the daughters of Jerusalem?

Does the fact that the Lord will “cleanse the bloodstains from Jerusalem ( his own bloodstains from the Cross?) by a spirit of judgement and a spirit of burning”, refer to the final judgement or to the judgement every one of us will face at the end of this earthly life ?

John seems to be referencing this passage in Revelation 21-22. He describes a physical renewal of the creation, a bodily resurrection of the dead, and the creation of a new Jerusalem. I tend to read the new Jerusalem as a physical place on earth, rather than in a spiritual location we think of as Heaven.

I think both. In Revelation it mentions the battle of Armageddon wherein the unrighteous armies are defeated by the Lamb. Then it speaks of the resurrection and judgment of the dead, and then the coming of the new Jerusalem.

[St. Thomas Aquinas, Isaiah, C. 4, L. 2, 138]

Here he promises holiness in spiritual things, and concerning this he does three things.

First he promises to spread among the people the name of holiness, which to a greater extent drew those desiring glory; hence he says, and it shall come to pass , this which follows, in those times, every one that shall be left in Zion , in life, and that shall remain , of those conquered by death, shall be called holy , below: you shall be called the priests of the Lord: to you it shall be said: ye ministers of our God (Isa 61:6); below: that which shall stand therein, shall be a holy seed (Isa 6:13).

Second, he places the sign of those made holy: every one that is written in life in Jerusalem , that is, all whose procession of life and generation from their parents was written in the annals, as we read in Ezra 2:59–63 concerning some who usurped an office to themselves, and whose genealogy was not enumerated.

Third, the manner of sanctification: if the Lord shall wash away , that is, if yet before he shall wash away, the filth , of vices, and the blood , of the prophets poured out, out of the midst thereof , not in a corner, by which the public nature of their sin is noted, by the spirit of judgment , as to the equity of the punishment, and by the spirit of burning , that is, of tribulation as to its harshness. By the spirit , that is, the wind, metaphorically, by which an area is purged: a burning wind is in the ways that are in the desert of the way of the daughter of my people (Jer 4:11), supply: to fan and to cleanse.

post script: "the blood of the martyrs is the seed of the Church " (Tertullian; Apologeticus, Chapter 50).

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