Parashas Bo · Passuk 12:8
Chabad.org — English translation + Rashi
Torah Temimah points to Pesachim 140b (verified).
Sefaria — Exodus 12:8
Sefaria — Pesachim 140b
E-Daf — Pesachim 140b
English: From when is their time of eating? From when it grows dark; if one did not eat from dark, one may eat all night; if one did not eat all night, one may not eat them further.
On the daf / in context: See the cited source for the full section.
Derash on the verse (Tosefta Pesachim) — not a formal named middah of the 13.
Eating begins at nightfall and may continue through the night only.