Parashas Bo · Shemos 12:8 · TT note 1
Torah Temimah on Shemos 12:8, note 1 (on אֶת הַבָּשָׂר) points to Pesachim 85a.
Sefaria — Exodus 12:8
Sefaria — Torah Temimah on Exodus 12:8
Sefaria — Pesachim 85a
E-Daf — Pesachim 85a
English: And it was taught: “And you shall not break a bone of it” — whether a bone that has marrow or a bone that has no marrow. And how do I fulfill “And they shall eat the meat on this night”? With the meat that is on the outside of the bone.
Clarifying derash: the mitzvah of eating the meat refers to flesh on the bone, not marrow inside (which would require breaking).
The obligation is to eat the meat on the outside of the bone; one does not break bones to reach marrow.