Deuteronomy Chapter 18, Verse 20
From BibleWiki
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.
20: But the prophet, who being corrupted with pride, shall speak in
my name things that I did not command him to say, or in the name of
strange gods, shall be slain.
20: But the prophet whosoever shall impiously speak in my name a word which I have not commanded him to speak, and whosoever shall speak in the name of other gods, that prophet shall die.
Deuteronomy Chapter 18, Verse 20/commentary

