Parashas Behar · Aliyah 1 · Passuk 25:12
Chabad.org — English translation + Rashi
Torah Temimah cites Yerushalmi Sheviis 9:3.
English: “From the field you shall eat.” As long as you are eating from the field you may eat what is in the house; when it is finished from the field, finish from the house.
Classical derasha (Yerushalmi) — bi’ur.
As long as produce remains available in the field one may continue to eat the corresponding produce stored in the house; when the field is finished, the house store must also be removed (bi’ur).