Since the days of Jeshua, had not the children of Israel done so The meaning here cannot be that this festival had never been observed since Joshua's time, because we are informed, (Ezra 3:4,) that it was kept at their return from Babylon; but the joy, since that time, had never been so great as it was now, “for which the Jews themselves,” says Dr. Dodd, “assign this reason; that in the days of Joshua they rejoiced, because they had gotten possession of the land of Canaan; and now they equally rejoiced, because they were restored and quietly settled in it, after they had been long cast out of it.” Or, we should rather say, they not only had the same causes for rejoicing which they formerly had, but special causes to increase their joy. To this Poole adds, They never, since Joshua's time, kept this feast so solemnly and religiously: for whereas, at other times, only the first and last day of that feast were celebrated with a holy convocation, now there was a holy convocation, and the people assembled, and attended upon the reading of the law every day of this feast.
Related Commentaries of Nehemiah 8:17
Nehemiah 8:17
17 And all the congregation of them that were come again out of the captivity made booths, and sat under the booths: for since the days of Jeshua the son of Nun unto that day had not the children of Israel done so. And there was very great gladness.