Related for Menachot 5:1

כָּל הַמְּנָחוֹת בָּאוֹת מַצָּה, חוּץ מֵחָמֵץ שֶׁבַּתּוֹדָה וּשְׁתֵּי הַלֶּחֶם, שֶׁהֵן בָּאוֹת חָמֵץ. רַבִּי מֵאִיר אוֹמֵר, שְׂאֹר בּוֹדֶה לָהֶן מִתּוֹכָן וּמְחַמְּצָן. רַבִּי יְהוּדָה אוֹמֵר, אַף הִיא אֵינָהּ מִן הַמֻּבְחָר, אֶלָּא מֵבִיא אֶת הַשְּׂאֹר, וְנוֹתֵן לְתוֹךְ הַמִּדָּה, וּמְמַלֵּא אֶת הַמִּדָּה. אָמְרוּ לוֹ, אַף הִיא הָיְתָה חֲסֵרָה אוֹ יְתֵרָה:

All grain offerings must be offered unleavened, with the exception of the leavened cakes of the thanksgiving offering and the two loaves [of Shavuot] which are offered leavened. Rabbi Meir says: he takes the leaven from [the grain offerings] themselves and with this they are leavened. Rabbi Judah says: that is not the best way, rather [first of all] he brings leaven and puts into the measuring vessel and then he fills the measuring vessel up [with flour]. But they said to him: even so [it is not satisfactory], for it would be sometimes too little and sometimes too much.

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