Deuteronomy 18:20-22

^{Tools
20} But the prophet who dares to speak a message in My name that I have not commanded him to speak, or who speaks in the name of other gods—that prophet must die.’ ^{Tools
21} You may say to yourself, ‘How can we recognize a message the Lord has not spoken?’ ^{Tools
22} When a prophet speaks in the Lord’s name, and the message does not come true or is not fulfilled, that is a message the Lord has not spoken. The prophet has spoken it presumptuously. Do not be afraid of him.