Ezekiel 14:8-10

I will oppose that person! I will cut the idolator off from my people as an example and a warning to others. And then you will know that I am YAHWEH. And if the prophet is tricked into speaking a prophetic word, it is I, YAHWEH, who allowed this to happen, for I have decided to punish him with death. Both the prophet and the one who consults him will be equally punished for their guilt.