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.
I am against them that prophesy false dreams - third class; inventors of "lies:" the climax, and worst of the three.
Lightness - wanton inventions (Zephaniah 3:4).
They shall not profit - i:e., they shall greatly injure this people.