Parashas Behar · Aliyah 4 · Passuk 25:28
Chabad.org — English translation + Rashi
Torah Temimah cites Sifra (Torat Kohanim).
English: “And it shall go out in the Yovel.” This teaches that the Yovel releases [the field].
Classical derasha (Sifra).
If neither the original owner nor a relative redeems the field, it automatically reverts to the original owner at Yovel.