תִּֽהְיֶ֙ינָה֙ הֶעָרִ֣ים הָאֵ֔לֶּה עִ֣יר עִ֔יר וּמִגְרָשֶׁ֖יהָ סְבִיבֹתֶ֑יהָ כֵּ֖ן לְכָל־הֶעָרִ֥ים הָאֵֽלֶּה׃ (ס)
even these cities, every one with the open land round about it; thus it shall be with all these cities.
Read midrashic interpretation of Joshua 21:42: and classical rabbinic exegesis.