Parashas Bo · Passuk 12:20
Chabad.org — English translation + Rashi
Torah Temimah points to Pesachim 35b (verified).
Sefaria — Exodus 12:20English: The priests may fulfill the mitzvah with challah and terumah. This might seem obvious, but one might have thought that the matzah must be suitable for everyone; the repeated term “matzah” teaches otherwise.
On the daf / in context: See the cited source for the full section.
Derash using the repeated word “matzah” to include matzah that is not available to every person.
Priests may fulfill the mitzvah with challah or terumah matzah even though such food is not available to everyone.