Reference for Menachot 11:1

שְׁתֵּי הַלֶּחֶם נִלּוֹשׁוֹת אַחַת אַחַת, וְנֶאֱפוֹת אַחַת אַחַת. לֶחֶם הַפָּנִים נִלּוֹשׁ אֶחָד אֶחָד, וְנֶאֱפֶה שְׁנַיִם שְׁנָיִם. וּבִטְפוּס הָיָה עוֹשֶׂה אוֹתָן. וּכְשֶׁהוּא רָדָן, נוֹתְנָן בִּטְפוּס, כְּדֵי שֶׁלֹּא יִתְקַלְקְלוּ:

<i>Shtei Halechem</i> [The two leavened loaves of wheat brought as offerings on Shavuot, which permitted using the new grain for holy offerings.] were kneaded one at a time and baked one at a time. <i>Lechem Hapanim</i> [twelve, specially shaped unleavened loaves offered each Shabbat on the golden table in the Temple] were kneaded one at a time and baked two at a time. They were made in a form and when he took them out of the oven he would place them in a form so they wouldn't spoil.

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