Neh 8:7

“Also Jeshua, and Bani, and Sherebiah, Jamin, Akkub, Shabbethai, Hodijah, Maaseiah, Kelita, Azariah, Jozabad, Hanan, Pelaiah, and the Levites,.... That is, others of them besides those named; for they seem all to be Levites, unless they can be thought to be priests, and so the Levites are distinguished from them; but the former seems evident from Neh 9:4 these also caused the people to understand the law; as well as Ezra; from whence it is plain that he did not only read the law, but gave the sense of it, especially where there was any seeming difficulty, and these men were assisting in the same work: and the people stood in their place; to hear the law read and explained; they did not move from their first station, but continued in it from morning to noon; they were both attentive and constant.”

“caused the people to understand the law . . . gave the sense--Commentators are divided in opinion as to the import of this statement. Some think that Ezra read the law in pure Hebrew, while the Levites, who assisted him, translated it sentence by sentence into Chaldee, the vernacular dialect which the exiles spoke in Babylon. Others maintain that the duty of these Levites consisted in explaining to the people, many of whom had become very ignorant, what Ezra had read.”