Parashas Ki Sisa · Passuk 34:18
Torah Temimah points to classical source on this unit (verified).
English: “The Festival of Matzos” — remembrance of the Exodus from Egypt.
Derash on Chag haMatzos in the renewed covenant.
The Festival of Matzos you shall keep; seven days you shall eat matzos, as I commanded you, at the appointed time of the month of Aviv, for in the month of Aviv you went out from Egypt.