In those days shall Judah be saved, and Jerusalem shall dwell safely: and this is the name wherewith she shall be called, The LORD our righteousness.
Jerusalem shall dwell safely - in Jeremiah 23:6, instead of this, it is "Israel."
This is the name wherewith she shall be called, The Lord our Righteousness - "the name" in the Hebrew has here to be supplied from that passage; and for "HE" (Messiah, the antitypical "Israel"), the antecedent there (Isaiah 49:3), we have "SHE" here, i:e., Jerusalem. She is called by the same name as Messiah, "The Lord our righteousness," by virtue of the mystical oneness between her (as the literal representative of the spiritual Church) and her Lord and Husband. Thus, whatever belongs to the Head belongs also to the members (Ephesians 5:30; Ephesians 5:32). Hence, the Church is called "Christ" (Romans 16:7; 1 Corinthians 12:12). The Church hereby professes to draw all her righteousness from Christ (Isaiah 45:24-25). It is for the sake of Jerusalem, literal and spiritual, that God the Father gives this name (Yahweh-tsidkenu, "The Lord our Righteousness") to Christ.