Reference for Middot 1:7

שְׁנַיִם שְׁעָרִים הָיוּ לְבֵית הַמּוֹקֵד, אֶחָד פָּתוּחַ לַחֵיל וְאֶחָד פָּתוּחַ לָעֲזָרָה. אָמַר רַבִּי יְהוּדָה, זֶה שֶׁהָיָה פָתוּחַ לָעֲזָרָה, פִּשְׁפָּשׁ קָטָן הָיָה לוֹ, שֶׁבּוֹ נִכְנָסִין לִבְלֹשׁ אֶת הָעֲזָרָה:

The Hall of Fire had two gates, one opened to the <i>Cheil</i> and one opened to the courtyard. Rabbi Judah said: the one that was open to the courtyard had a small doorway that they [the <i>Kohanim</i>] would enter through it to observe the courtyard.

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