Deuteronomy 18:20
But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
Torrey's Topical Textbook—AKJV

Jeremiah 14:15
Therefore thus said the LORD concerning the prophets that prophesy in my name, and I sent them not, yet they say, Sword and famine shall not be in this land; By sword and famine shall those prophets be consumed.
Torrey's Topical Textbook—AKJV

Jeremiah 23:15
Therefore thus said the LORD of hosts concerning the prophets; Behold, I will feed them with wormwood, and make them drink the water of gall: for from the prophets of Jerusalem is profaneness gone forth into all the land.
Torrey's Topical Textbook—AKJV