Prophesying falsely about Peace can be a risky business, even for ones like Rabbi Kahana...
Jeremiah 29:8-9 KJVS
[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 falsely unto you in my name: I have not sent them, saith the Lord .