Chabad.org — English translation + Rashi
Torah Temimah points to Menachos 53a.
E-Daf.com — Menachos 53a
HebrewBooks / Shas PDF
English: “It shall be matzah” — might this be only preferred? The verse says “it shall be” — to make it indispensable.
Diyuk of tihyeh as me’akev — the unleavened state is required, not merely preferred.
Unleavened state is required; leaven invalidates. The Torah’s insistence “it shall be matzah” is read as establishing an absolute condition: any leavening of the machavas minchah renders it invalid.