Parashas Behar · Aliyah 1 · Passuk 25:04
Chabad.org — English translation + Rashi
Torah Temimah cites Sifra (Torat Kohanim).
English: “A Sabbath to Hashem.” It was taught: Just as “a Sabbath to Hashem” is said regarding the Sabbath of Creation, so “a Sabbath to Hashem” is said regarding the seventh year.
Classical derasha (Sifra) — parallel language with the weekly Sabbath.
The expression “a Sabbath to Hashem” used for the weekly Sabbath is likewise used for the Shemittah year, underscoring its sanctity.