The dwelling places and assemblies of Mount Zion mentioned in Isaiah 4:5 mean, respectively, the good of the celestial church and the truths of that good.

(References: Apocalypse Explained 594)

In Revelation 11:9, this signifies to the end and the beginning, or to the end of the present church and the beginning of a new church. (Apocalypse Revealed 505) It also signifies the same as a week because it is half of seven. (Apocalypse Revealed 505[2])