Albert Barnes Commentary 2 Chronicles 34:13

"Also they were over the bearers of burdens, and set forward all that did the work in every manner of service: and of the Levites there were scribes, and officers, and porters." — 2 Chronicles 34:13 (ASV)

Of the Levites there were scribes - Until now, the word “scribe” has never been used to designate a class (Compare to 1 Kings 4:3). But here an order of scribes, forming a distinct division of the Levitical body, has been instituted. The class itself probably originated in the reign of Hezekiah ; and it is probably to the rise of this class that we are indebted for the preservation of so many prophecies belonging to Hezekiah’s time, while the works of almost all previous prophets—Ahijah, Iddo, Shemaiah, Jehu, the son of Hanani, and probably many others—have perished.