וַיִּֽטַּהֲר֔וּ הַכֹּהֲנִ֖ים וְהַלְוִיִּ֑ם וַֽיְטַהֲרוּ֙ אֶת־הָעָ֔ם וְאֶת־הַשְּׁעָרִ֖ים וְאֶֽת־הַחוֹמָֽה׃
祭司和利未人先潔淨自己，然後潔淨百姓、城門和城牆。
Rashi
purified themselves First they purified themselves, and afterwards they purified the others.
Rashi
and the gates and the wall that there should be no uncleanliness in the city.