Deuteronomy 18:18-20

I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him.

And it shall come to pass, that whosoever will not hearken unto my words which he shall speak in my name, I will require it of him.

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.