Parashas Behar · Aliyah 5 · Passuk 25:30
Chabad.org — English translation + Rashi
Torah Temimah cites Sifra (Torat Kohanim).
English: “Which has no wall.” Read it as “which has a wall.”
Classical derasha (Sifra) — ketiv/keri style reading.
The text is understood as referring to a city that has a wall (despite the written form), i.e., a properly walled city from the time of Yehoshua.