Parashas Bo · Shemos 12:9 · TT note 2
Torah Temimah on Shemos 12:9, note 2 (on אַל תֹּאכְלוּ מִמֶּנּוּ נָא) points to Pesachim 96a.
Sefaria — Exodus 12:9
Sefaria — Torah Temimah on Exodus 12:9
Sefaria — Pesachim 96a
E-Daf — Pesachim 96a
English: I have only the Pesach of Egypt that is not eaten underdone; 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: the ban on underdone meat applies for all time.
The prohibition of eating the Pesach underdone (na) applies to the Pesach of the generations as well.