Deuteronomy 18:20-22

Good News Translation

²⁰ But if any prophet dares to speak a message in my name when I did not command him to do so, he must die for it, and so must any prophet who speaks in the name of other gods.’

²¹ “You may wonder how you can tell when a prophet's message does not come from the Lord. ²² If a prophet speaks in the name of the Lord and what he says does not come true, then it is not the Lord's message. That prophet has spoken on his own authority, and you are not to fear him.