Again the citation of Isaiah comes as the confirmation of the explanation. The Old World redemption of the land of Jerusalem will take place, and therefore be cause to break into joyous song.
Reference: The reference to Isaiah continues:
Isaiah 52:9-10
9 ¶ Break forth into joy, sing together, ye waste places of Jerusalem: for the LORD hath comforted his people, he hath redeemed Jerusalem.
10 The LORD hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God.