Parashas Bo · Shemos 12:6 · TT note 7
Torah Temimah on Shemos 12:6, note 7 (on בֵּין הָעַרְבָּיִם) points to Pesachim 61a.
Sefaria — Exodus 12:6
Sefaria — Torah Temimah on Exodus 12:6
Sefaria — Pesachim 61a
E-Daf — Pesachim 61a
English: If one slaughtered it before noon — it is invalid, because it is said “between the evenings.”
Halachic boundary of time from בֵּין הָעַרְבָּיִם: excludes the morning and the hours before midday.
Pesach slaughtered before midday is invalid.