Parashas Bo · Shemos 12:15 · TT note 5
Torah Temimah on Shemos 12:15, note 5 (on אַךְ בַּיּוֹם) points to the day-not-night limit for hashbasah (Pesachim 5a area).
Sefaria — Exodus 12:15
Sefaria — Torah Temimah on Exodus 12:15
Sefaria — Pesachim 5a
E-Daf — Pesachim 5a
English: “But on the day” — by day, and not by night.
Time-limit: hashbasas se’or is a daytime act on the fourteenth.
Removal of se’or is performed by day (the fourteenth), not at night; later notes develop that “the first day” here is the fourteenth.