וְהָֽיְתָה־זֹּ֨את לָכֶ֜ם לְחֻקַּ֣ת עוֹלָ֗ם לְכַפֵּ֞ר עַל־בְּנֵ֤י יִשְׂרָאֵל֙ מִכָּל־חַטֹּאתָ֔ם אַחַ֖ת בַּשָּׁנָ֑ה וַיַּ֕עַשׂ כַּאֲשֶׁ֛ר צִוָּ֥ה יְהוָ֖ה אֶת־מֹשֶֽׁה׃ (פ)
이는 너희의 영원히 지킬 규례라 이스라엘 자손의 모든 죄를 위하여 일 년 일 차 속죄할 것이니라 아론이 여호와께서 모세에게 명하신 대로 행하니라
Rashi on Leviticus
'ויעש כאשר צוה וגו AND HE DID AS [THE LORD] COMMANDED [MOSES] etc. — When the next Day of Atonement arrived he (Aaron) did everything as is here set forth in order. And Scripture only states this in order to declare the praise of Aaron — that he did not attire himself with them (the official garments) for his own aggrandisement, but as one who was executing the ordinance of his King (Sifra, Acharei Mot, Chapter 8 10).
Ramban on Leviticus
AND HE DID AS THE ETERNAL COMMANDED MOSES. This means that Aaron fulfilled all that he was commanded, and he was careful all his life not to enter the Holy of Holies except on the Day of Atonement in order to bring his offerings, according to all that G-d commanded Moses.
Sforno on Leviticus
והיתה זאת לכם לחקת עולם לכפר, that the very day itself has the power to confer atonement even when there is neither a Temple nor a Temple service. In the words of our sages (Yuma 86) “repentance suspends the imposition of retribution and the arrival of the date of the Day of Atonement completes the atonement.”