The gate of Benjamin was some gate that looked toward the inheritance of that tribe, or where those used to go out who went that way; we read of it Jeremiah 38:7. Irijah was a captain of the guard that was set to watch at the gates, to keep people from going out, or at least some persons; for it should seem by Jeremiah's endeavour to go out in the crowd, they suffered many to go out, as is usual in sieges, when victuals grow scarce; and though the Chaldeans were at present gone, yet they were not out of fear of their coming back. This captain apprehends Jeremiah, as one who was about to desert the city, and fall off to the Chaldeans. That Hananiah the grandfather of this Irijah was the false prophet we read of Jer 28, who died according to Jeremiah's prophecy, and this his grandchild apprehended Jeremiah in some revenge of his grandfather, is but uncertainly guessed. But Jeremiah's so frequent prophesying that the Chaldeans should take the city exposed him to this suspicion probably.
Related Commentaries of Jeremiah 37:13
Jeremiah 37:13
13 And when he was in the gate of Benjamin, a captain of the ward was there, whose name was Irijah, the son of Shelemiah, the son of Hananiah; and he took Jeremiah the prophet, saying, Thou fallest away to the Chaldeans.