Albert Barnes Commentary Jeremiah 35:4

"and I brought them into the house of Jehovah, into the chamber of the sons of Hanan the son of Igdaliah, the man of God, which was by the chamber of the princes, which was above the chamber of Maaseiah the son of Shallum, the keeper of the threshold." — Jeremiah 35:4 (ASV)

The title man of God, that is, prophet, belongs to Hanan, identified by many with Hanani (2 Chronicles 16:7). The sons of Hanan were probably his disciples. If so, we find a religious school or sect, regularly established in the precincts of the temple, of whose views and modes of interpretation we know nothing. Plainly, however, the Hananites were friendly to Jeremiah and lent him their hall for his purpose.

The chamber of the princes — Probably the council chamber in which the great officers of state met for the dispatch of business.

The keeper of the door — There were three of these keepers, corresponding to the outer and inner courts of the temple, and the entrance to the temple itself. They were officers of high rank, having precedence next to the high priest and his deputy.