(19) Where are now your prophets . . .?--The failure of the past predictions of the false prophets is urged on the king as a reason why he should not trust them in the present crisis. They had assured him (Jeremiah 28:3) that within two years the city should be delivered, and the result had been that it had been besieged. The temporary departure of the Chaldaeans had again raised their hopes, and they were now tempting the king with the assurance that the Egyptian army would make short work of them.

Matthew Henry's Concise Commentary

37:11-21 There are times when it is the wisdom of good men to retire, to enter into their chambers, and to shut the doors, Isa 26:20. Jeremiah was seized as a deserter, and committed to prison. But it is no new thing for the best friends of the church to be belied, as in the interests of her worst enemies. When thus falsely accused, we may deny the charge, and commit our cause to Him who judges righteously. Jeremiah obtained mercy of the Lord to be faithful, and would not, to obtain mercy of man, be unfaithful to God or to his prince; he tells the king the whole truth. When Jeremiah delivered God's message, he spake with boldness; but when he made his own request, he spake submissively. A lion in God's cause must be a lamb in his own. And God gave Jeremiah favour in the eyes of the king. The Lord God can make even the cells of a prison become pastures to his people, and will raise up friends to provide for them, so that in the days of famine they shall be satisfied.

Gill's Exposition of the Entire Bible

Where are now your prophets that prophesied unto you,.... Your false prophets, as the Targum; what is become of their prophecies? where is the truth of them, to which general credit has been given? where are they? let them appear and defend themselves, if they can, from the charge of lying, and of being false prophets? or where are they? tacitly suggesting the different circumstances of him and them; he, who was a true prophet, was laid in a prison; they, who were false prophets, were caressed in the palaces of the king and his nobles, and in favour with the people in general:

saying, the king of Babylon shall not come against you, nor against this land? gave out that the king of Babylon would never invade the land of Judea, or besiege the city of Jerusalem, which proved false; and still they had the front to say, that when the siege was raised, he would never come again; whereas he was then returned to it, and was now besieging it; so that here were notorious falsehoods delivered out by them.

BibleApps.com