C. F. Keil and Franz Delitzsch on Nehemiah 8:5

Neh 8:5

Ezra, standing on the raised platform, was above the assembled people (he was כּל־העם מעל). When he opened the book, it was “in the sight of all the people,” so that all could see his action; and “all the people stood up” (עמדוּ). It cannot be shown from the O.T. that it had been from the days of Moses a custom with the Israelites to stand at the reading of the law, as the Rabbis assert; comp. Vitringa, de Synag. vet. p. 167.