Jeremiah 28:15

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.

The Lord had not sent Hananiah, and by his false prophecy he caused the people to trust in a lie. His lie held out deliverance and prosperity, promising an early end to Babylonian rule in direct opposition to God's warning through Jeremiah that the people must submit to Babylon for the appointed time, while condemning Jeremiah's warnings. That pleasing message strengthened the people's unbelief in Jeremiah's true warning and encouraged rebellion against the Lord, teaching them to resist the true prophet's counsel.

Jeremiah declared to Hananiah's face that he was unsent and was making the people trust falsehood, exposing the source and effect of his work together. The false hope of speedy release turned hearts away from the commanded submission and confirmed them in defiance of the divinely appointed discipline. By upholding prosperity against reproof, Hananiah taught resistance to correction and nourished contempt for the faithful warning.

Jeremiah predicted that Hananiah would die that very year for his falsehood and rebellion. Hananiah's death later that same year, in the seventh month, fulfilled the prediction and confirmed the truth of Jeremiah's message and warning against him.