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Ramban on Exodus 12:20/רמב"ן על שמות י״ב:כ׳

אכָּל מַחְמֶצֶת לְהָבִיא אֶת תַּעֲרָבְתּוֹ, לְשׁוֹן רַשִׁ"י (רש"י על שמות י"ב:כ'). וְגַם זֶה אֵינוֹ, שֶׁהֲלָכָה הִיא כְּדִבְרֵי חֲכָמִים (שם מג.) עַל חָמֵץ דָּגָן עָנוּשׁ כָּרֵת, וְעַל עֵרוּבוֹ בְּלֹא כְלוּם:

1ANYTHING THAT IS LEAVENED YE SHALL NOT EAT. “This includes food with which leaven is mixed.” Thus the language of Rashi.This too is not in accordance with the final decision of the law, for the adopted opinion is like that of the Sages who say that the penalty incurred for eating leavened food is extinction, but for food with an admixture of leaven, there is no specific verse that includes it, [although it is nevertheless forbidden].²²⁵ in accordance with the opinion of Rabbi Eliezer. Maimonides and other scholars have all accepted the decision of Rabbi Eliezer. See my Hebrew commentary, p. 333.