Jeremiah 29:31
"Send to all them of the captivity, saying, Thus saith the LORD concerning Shemaiah the Nehelamite; Because that Shemaiah hath prophesied unto you, and I sent him not, and he caused you to trust in a lie:"
Cross References (ranked by relevance)
Jeremiah 29:9
For they prophesy falsely unto you in my name: I have not sent them, saith the LORD.
2 Peter 2:1
But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
Jeremiah 23:21
I have not sent these prophets, yet they ran: I have not spoken to them, yet they prophesied.