Mishnayos Shevuos Perek 2 Mishnah 2

As for the boundaries of the Temple with regard to the halakhot of impurity, the same halakha applies to one who enters the area that was part of the original Temple courtyard and to one who enters the later addition to the Temple courtyard, because the additional section is sanctified with the full sanctity of the Temple courtyard. The mishna notes: As, additions can be made to the city of Jerusalem or to the Temple courtyards only by a special body comprising the king, a prophet, the Urim VeTummim, and the Sanhedrin of seventy-one judges, and with two thanks-offerings and with a special song. Once the addition to the courtyard is made by this body and this process, it is given the full sanctity of the original courtyard area. The mishna provides certain details of the consecration ceremony. And the court would move forward, and two thanks-offerings would be brought after them, and all of the Jewish people would follow behind them. When they would reach the end of the place that they desired to consecrate, the inner thanks-offering would be eaten and the outer one would be burned. The details of this ceremony will be described in the Gemara. And with regard to any addition to the Temple that was not made with all these ceremonial procedures, one who enters there while ritually impure is not liable to bring an offering if his entry was unwitting, nor to be punished with karet, excision from the World-to-Come, if his entry was intentional.

אֶחָד הַנִּכְנָס לָעֲזָרָה וְאֶחָד הַנִּכְנָס לְתוֹסֶפֶת הָעֲזָרָה, שֶׁאֵין מוֹסִיפִין עַל הָעִיר וְעַל הָעֲזָרוֹת אֶלָּא בְמֶלֶךְ וְנָבִיא וְאוּרִים וְתֻמִּים וּבְסַנְהֶדְרִין שֶׁל שִׁבְעִים וְאֶחָד וּבִשְׁתֵּי תוֹדוֹת וּבְשִׁיר. וּבֵית דִּין מְהַלְּכִין וּשְׁתֵּי תוֹדוֹת אַחֲרֵיהֶם, וְכָל יִשְׂרָאֵל אַחֲרֵיהֶם. הַפְּנִימִית נֶאֱכֶלֶת וְהַחִיצוֹנָה נִשְׂרָפֶת. וְכֹל שֶׁלֹּא נַעֲשָׂה בְכָל אֵלּוּ, הַנִּכְנָס לְשָׁם אֵין חַיָּבִין עָלֶיהָ: