Isa 64:10 | JFB | STEP | 10. holy cities-- No city but Jerusalem is called "the holy city" ( ; ); the plural, therefore, refers to the upper and the lower parts of the same city Jerusalem [Vitringa]; or all Judea was holy to God, so its cities were deemed "holy" [Maurer]. But the parallelism favors Vitringa. Zion and Jerusalem (the one city) answering to "holy cities."

‏ Isaiah 64:10

10. holy cities--No city but Jerusalem is called "the holy city" (Is 48:2; 52:1); the plural, therefore, refers to the upper and the lower parts of the same city Jerusalem [Vitringa]; or all Judea was holy to God, so its cities were deemed "holy" [Maurer]. But the parallelism favors Vitringa. Zion and Jerusalem (the one city) answering to "holy cities."