16:11ט״ז:י״א
1 א

וכפר בעדו וגו'. וִדּוּי שֵׁנִי, עָלָיו וְעַל אֶחָיו הַכֹּהֲנִים, שֶׁהֵם כֻּלָּם קְרוּיִים בֵּיתוֹ, שֶׁנֶּאֱמַר "בֵּית אַהֲרֹן בָּרֲכוּ אֶת ה'" וְגוֹ' (תהילים קל"ה), מִכָּאן שֶׁהַכֹּהֲנִים מִתְכַּפְּרִין בּוֹ, וְכָל כַּפָּרָתָן אֵינָהּ אֶלָּא עַל טֻמְאַת מִקְדָּשׁ וְקָדָשָׁיו, כְּמוֹ שֶׁנֶּאֱמַר (פסוק ט"ז), "וְכִפֶּר עַל הַקֹּדֶשׁ מִטֻּמְאֹת" וְגוֹ' (ספרא; שבועות ז'):

'וכפר בעדו וגו‎ AND HE SHALL MAKE AN EXPIATION FOR HIMSELF etc. — This implies a second confession of sins which he was to make for himself and on behalf of his brother-priests, who may all be termed “his house”, as it said (Psalms 135:19) “Bless the Lord, o house of Aaron, etc." (cf. Shevuot 14a). Hence we learn that the priests become atoned for by means of it (the bullock). The expiation effected by it extended, however, only to those sins committed by causing uncleanness to the Sanctuary or holy things (i.e. by the priests having entered the Sanctuary or eaten of the holy things in such a state), as it is said (v. 16) “And he shall make an expiation for the holy place because of the uncleanness [of the children of Israel] etc.”.