Charles Ellicott Commentary Zechariah 8:21

"and the inhabitants of one [city] shall go to another, saying, Let us go speedily to entreat the favor of Jehovah, and to seek Jehovah of hosts: I will go also." — Zechariah 8:21 (ASV)

And the inhabitants of one city shall go to another. —LXX., καὶ συνελεύσονται κατοικοῦντες πέντε πόλεις εἰς μίαν πόλιν, and the inhabitants of five cities shall come together to one city, borrowing the word “five” possibly from Isaiah 19:18, In that day there shall be five cities ... one shall be called ....