Parashas Bo · Shemos 12:8 · TT note 5
Torah Temimah on Shemos 12:8, note 5 (on בַּלַּיְלָה) points to Mechilta / Pesachim 96a.
Sefaria — Exodus 12:8
Sefaria — Torah Temimah on Exodus 12:8
Sefaria — Mechilta
English: I have only the Pesach of Egypt that is eaten at night; the Pesach of the generations from where? Therefore it says, “You shall perform this service in this month” — that all the services of this month should be like this one.
Hekkesh from Egypt to the generations: nighttime eating applies to all future Pesachs.
The Pesach of the generations is likewise eaten only at night.