TT #228 · Parshas Shemini · Aliyah 7 · Passuk 39
Chabad.org — Vayikra Chapter 11 with Rashi
English: “From the animal”: flesh detached from a living animal is not treated like the characteristic limb unless it includes the corresponding flesh, sinews, and bones.
Chullin 128b.
E-Daf.com — Chullin 128b (Tsurras Hadaf)
Analogy — The Chazal derives the stated rule from the wording and comparison in the verse.
Detached flesh alone is not equivalent to the whole characteristic limb.