From where do we learn to include the other meal offerings? Scripture teaches by saying "the whole meal offering" (Leviticus 6:10). One might think that I have only those meal offerings whose remnants are eaten, that they may not be made as leaven; from where do I include meal offerings whose remnants are not eaten? Scripture teaches by saying "the whole meal offering that you bring to the LORD." Rabbi Yose the Galilean says: this comes to include the showbread. Rabbi Akiva says: it comes to include the meal offering that accompanies the drink offerings. "It shall not be made as leaven" (Leviticus 2:11). One might think there is a single prohibition covering all of them together; Scripture teaches by saying "it shall not be baked as leaven" (Leviticus 6:10). Baking was already included in the general rule, so why was it singled out? To draw a comparison to it and to tell you: just as baking is distinctive in that it is a single discrete act and one is liable for it on its own, so too I include the kneading and the shaping, and for every act involved in it one becomes liable on its own.
Why Every Meal Offering Is Forbidden to Be Made as Leaven
Yalkut Shimoni on Torah 451:2
מִנַּיִן לְרַבּוֹת שְׁאָר מְנָחוֹת תַּלְמוּד לוֹמַר "כָּל הַמִּנְחָה". יָכוֹל אֵין לִי שֶׁלֹּא תֵּעָשֶׂה חָמֵץ אֶלָּא מְנָחוֹת שֶׁשְּׁיָרֵיהֶם נֶאֱכָלִים, מְנָחוֹת שֶׁאֵין שְׁיָרֵיהֶן נֶאֱכָלִים מִנַּיִן, תַּלְמוּד לוֹמַר "כָּל הַמִּנְחָה אֲשֶׁר תַּקְרִיבוּ לַה'". רַבִּי יוֹסִי הַגְּלִילִי אוֹמֵר, לְהָבִיא לֶחֶם הַפָּנִים. רַבִּי עֲקִיבָא אוֹמֵר, לְהָבִיא מִנְחַת נְסָכִים. לֹא תֵעָשֶׂה חָמֵץ, יָכוֹל לָאו אֶחָד עַל כֻּלָּן, תַּלְמוּד לוֹמַר (ויקרא ו, י) "לֹא תֵאָפֶה חָמֵץ", אֲפִיָּה בִּכְלָל הָיְתָה, וְלָמָּה יָצְתָה, לְהַקִּישׁ אֵלֶיהָ וְלוֹמַר לְךָ מָה אֲפִיָּה מְיֻחֶדֶת שֶׁהִיא מַעֲשֵׂה יְחִידִי, וְחַיָּבִין עָלֶיהָ בִּפְנֵי עַצְמָהּ, אַף אֲנִי מְרַבֶּה אֶת לִישָׁתָהּ וְאֶת עֲרִיכָתָהּ, וְכָל מַעֲשֶׂה שֶׁיֵּשׁ בָּהּ מֵבִיא עָלָיו בִּפְנֵי עַצְמוֹ.