Parashas Tetzaveh · Passuk 30:7
Chabad.org — English translation + Rashi
Torah Temimah points to Yerushalmi Berachos 1:1 (verified).
Sefaria — Exodus 30:7
Sefaria — Berachos 80a
E-Daf — Berachos 80a
English: Rabbi Yishmael teaches that the doubled “morning” establishes a defined boundary for the morning.
On the daf / in context: See the cited source for the full section.
Derash on the verse.
The verse establishes a special Temple definition of the morning period.