Your watchmen shall lift up their voices, With their voices they shall sing together; For they shall see eye to eye When the LORD brings back Zion.

I have set watchmen on your walls, O Jerusalem;
      They shall never hold their peace day or night.
      You who make mention of the LORD, do not keep silent, 
      And give Him no rest till He establishes
      And till He makes Jerusalem a praise in the earth. (Isaiah 62:6,7)