Adam Clarke on Nehemiah 9:1

Now in the twenty and fourth day - The feast of trumpets was on the first day of this month; on the fourteenth began the feast of tabernacles, which, lasting seven days, finished on the twenty-second; on the twenty-third they separated themselves from their illegitimate wives and children; and, on the twenty-fourth, they held a solemn day of fasting and confession of sin, and reading the law, which they closed by renewing their covenants.