Bede

He made for himself a large treasury, etc. This statement, where Nehemiah writes that he was not in Jerusalem, does not seem to pertain to the matters narrated above up to this point, but only to the present location; for the previous matters were seen to have been done or spoken at the time when the city was built and dedicated, when Nehemiah was still residing in Jerusalem; with those things diligently completed, he returned to the king, and while he was absent, Eliashib made a large treasury in which were stored those things …

Commentary on Ezra and Nehemiah ↗