Parashas Behar · Aliyah 1 · Passuk 25:05
Chabad.org — English translation + Rashi
Torah Temimah cites Sifra (Torat Kohanim).
English: “A year of complete rest.” This teaches that once the Shemittah year has ended, even though its fruit is still Shemittah produce, you are permitted to perform labor on the body of the tree itself, but its fruit remains forbidden until the fifteenth of Shevat.
Classical derasha (Sifra).
Once the Shemittah year has ended one may perform labor on the body of the tree itself, but the fruit remains forbidden until the fifteenth of Shevat.