Thus saith the LORD; I am returned unto Zion, and will dwell in the midst of Jerusalem: and Jerusalem shall be called a city of truth; and the mountain of the LORD of hosts the holy mountain.
I am returned unto Zion - i:e., I am determined to return. My decree to that effect is gone forth.
And Jerusalem shall be called, A city of truth - i:e., faithful to her God, who is the God of truth (Isaiah 1:21; Isaiah 1:26; John 17:17). Never yet fully fulfilled, therefore still to be so.
And the mountain of the Lord of hosts - (Isaiah 2:2-3).
The holy mountain - (Jeremiah 31:23).