Jeremiah being a second time confirmed in the truth of his revelation, and having likewise a special revelation relating to this false prophet, comes now and tells him his doom, viz. that he should die within a year, because he had taught people to believe, and to hope for, and trust to what was false, and they were never like to see.
Related Commentaries of Jeremiah 28:15
Jeremiah 28:15
15 Then said the prophet Jeremiah unto Hananiah the prophet, Hear now, Hananiah; The LORD hath not sent thee; but thou makest this people to trust in a lie.