And it shall come to pass— The doctrine of this period is twofold; first, that God by the spirit of judgment will purify and cleanse his church; and, secondly, that those who remain written among the living, i.e. the people of the Messiah, shall become truly holy. See Philippians 4:3.
Related Commentaries of Isaiah 4:3
Isaiah 4:3-4
3 And it shall come to pass, that he that is left in Zion, and he that remaineth in Jerusalem, shall be called holy, even every one that is written among the living in Jerusalem:
4 When the Lord shall have washed away the filth of the daughters of Zion, and shall have purged the blood of Jerusalem from the midst thereof by the spirit of judgment, and by the spirit of burning.