Reference for Menachot 11:3

חֲבִתֵּי כֹהֵן גָּדוֹל, לִישָׁתָן וַעֲרִיכָתָן וַאֲפִיָּתָן בִּפְנִים, וְדוֹחוֹת אֶת הַשַּׁבָּת. טִחוּנָן וְהֶרְקֵדָן אֵינָן דּוֹחוֹת אֶת הַשַּׁבָּת. כְּלָל אָמַר רַבִּי עֲקִיבָא, כָּל מְלָאכָה שֶׁאֶפְשָׁר לָהּ לֵעָשׂוֹת מֵעֶרֶב שַׁבָּת, אֵינָה דּוֹחָה אֶת הַשַּׁבָּת. וְשֶׁאִי אֶפְשָׁר לָהּ לֵעָשׂוֹת מֵעֶרֶב שַׁבָּת, דּוֹחָה אֶת הַשַּׁבָּת:

The high priest's cakes were kneaded, formed and baked inside [the Temple courtyard] and they override Shabbat [prohibitions]. Their grinding and sifting do not override Shabbat. Rabbi Akiva stated a general rule: Anything which can be done before Shabbat does not override the Shabbat, and whatever cannot be done before the Shabbat does override the Shabbat.

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