Two days after the solemn assembly (8:18) the people were still mourning over their sins (9:1). This was a genuine spiritual revival. In obedience to God's Law the people broke off forbidden alliances with non-Jews (cf. Deut. 23:3-8). They also confessed their ancestors' sins as well as their own, listened to the reading of the Law, and worshipped God (vv. 2-3).
"It is of interest that the congregation did not only confess their own sins, but also those of their ancestors. This is a recurring theme in the books of Ezra-Nehemiah. They felt their solidarity with past generations."68
". . . separation' [v. 2] has nothing to do with simply disliking someone. Separation has to do, principally, with religious commitment--with the idea of covenant."69
Seven Levites led the people in confession and worship (v. 4).