Parashas Bo · Shemos 12:15 · TT note 12
Torah Temimah on Shemos 12:15, note 12 (on תַּשְׁבִּיתוּ שְׂאֹר … כִּי כָּל אֹכֵל חָמֵץ) points to Beitzah 7b.
Sefaria — Exodus 12:15
Sefaria — Torah Temimah on Exodus 12:15
Sefaria — Beitzah 7b
E-Daf — Beitzah 7b
English: Rabbi Zeira said: Scripture opened with se’or and concluded with chametz, to tell you: this is se’or, this is chametz [they share the same measure].
Equating se’or and chametz from the verse’s shift in wording.
Beis Hillel take se’or and chametz as one measure (ke-zayis); the verse’s opening with se’or and ending with chametz supports treating them alike.