John Gill Commentary Jeremiah 28:15

"Then said the prophet Jeremiah unto Hananiah the prophet, Hear now, Hananiah: Jehovah hath not sent thee; but thou makest this people to trust in a lie." — Jeremiah 28:15 (ASV)

Then said Jeremiah the prophet unto Hananiah the prophet
The false prophet, as he is again called by the Targum, and in the Syriac version; where he went to him, and met with him, whether in the temple or elsewhere, is not mentioned; very probably in some public place, that there might be witnesses of what was said; for it was for the conviction of others, as well as for his own confusion, the following things are observed: hear now, Hananiah, the Lord has not sent you ;
though he spoke in his name, and pretended a mission from him, when he had none, which was abominable wickedness: but you make this people to trust in a lie :
that the Lord would break off the yoke of the king of Babylon, and free the nations from servitude to him, particularly Judea; and that the king, and his princes, and people, and the vessels of the temple, carried away with him, would be returned within two years; this the people depended on as coming from the Lord, when he was not sent by him.