Mishnayos Meilah Perek 2 Mishnah 7

One is liable for misuse of the shewbread, which is arranged on the Golden Table in the Sanctuary each Shabbat, from the moment that it was consecrated. Once it formed a crust in the oven it assumes the status of bread and its halakhic status is like that of offerings of the most sacred order after the animal was slaughtered, in that it was rendered susceptible to disqualification through contact with one who immersed that day, and through contact with one who has not yet brought an atonement offering, and it is rendered eligible for arrangement upon the Table in the Sanctuary. Once the bowls of frankincense brought with the shewbread of the previous week were sacrificed, one is liable to receive karet for eating the loaves due to violation of the prohibition of piggul, and the prohibition of notar, and the prohibition of partaking of consecrated food while ritually impure. But it is not subject to the halakhot of misuse, as at that point its consumption is permitted.

לֶחֶם הַפָּנִים, מוֹעֲלִין בּוֹ מִשֶּׁהֻקְדַּשׁ. קָרַם בַּתַּנּוּר, הֻכְשַׁר לְהִפָּסֵל בִּטְבוּל יוֹם וּבִמְחֻסַּר כִּפּוּרִים, וּלְהִסָּדֵר עַל גַּבֵּי הַשֻּׁלְחָן. קָרְבוּ הַבְּזִיכִין, חַיָּבִין עָלָיו מִשּׁוּם פִּגּוּל, נוֹתָר וְטָמֵא, וְאֵין בָּהֶן מְעִילָה: