Rejoice ye with Jerusalem... — The holy city is still thought of as a mother rejoicing in her new-born child; friends and neighbours (i e., the nations friendly to Israel) who had shown pity for her sufferings are now invited to participate in her joy.
Related Commentaries of Isaiah 66:10
Isaiah 66:10
10 Rejoice ye with Jerusalem, and be glad with her, all ye that love her: rejoice for joy with her, all ye that mourn for her: