Commentary of Charles Spurgeon, Adam Clarke & Matthew Henry
Behold, I am against the prophets, saith the LORD, that use 
their tongues, and say, He saith.
Behold, I am against them that prophesy false
dreams, saith the LORD, and do tell them, and cause my people to err by
their lies, and by their lightness; yet I sent them not, nor commanded
them: therefore they shall not profit this people at all, saith the
LORD.
Vs. 31,32
Behold, I am
against the prophets. They pretended to be for God, and made use of His
name, but were really against Him.
The prophets who used their tongues; הלקחים לשונם hallokechim 
leshonam, who lick or smooth with their tongues - gave their own counsels as Divine revelations, flattering them in
their sins, and promising peace, when God had not spoken; and prefaced
them....
they are very complaisant to the people, and say nothing but what is pleasing
and plausible.
The prophets who made up false stories, which they termed prophecies, revealed to them in dreams; and thus caused the people to err.
What greater indignity can be
done to the God of truth than to lay the brats of the father of lies at His
door?
