There have been, and there always will be, as long as the Church continues militant upon earth, persons to prophecy smooth things, to prophecy deceits, saying, peace, peace, when there is no peace. It began with the first lie of hell, in the garden of Eden. Genesis 3:3-4.
Related Commentaries of Jeremiah 29:8
Jeremiah 29:8-9
8 For thus saith the LORD of hosts, the God of Israel; Let not your prophets and your diviners, that be in the midst of you, deceive you, neither hearken to your dreams which ye cause to be dreamed.
9 For they prophesy falselya unto you in my name: I have not sent them, saith the LORD.