Thus cleansed I them. Rather, "And I cleansed them." The process of cleansing touched on in this verse, and also in Nehemiah 13:3, is not described. It probably resembled the process adopted by Ezra (Ezra 10:5-17).
And appointed the wards. i.e. "assigned their offices to the various priests and Levites" (see Nehemiah 11:11-24; Nehemiah 12:44; Nehemiah 13:13).