Adam Clarke on Jeremiah 23:30

I am against the prophets - Three cases are mentioned here which excited God's disapprobation:

1. The prophets who stole the word from their neighbor; who associated with the true prophets, got some intelligence from them, and then went and published it as a revelation which themselves had received, Jer 23:30.

2. 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, "Thus saith the Lord," Jer 23:31.

3. The prophets who made up false stories, which they termed prophecies, revealed to them in dreams; and thus caused the people to err, Jer 23:32.