Deuteronomy 18:20-22

Complete Jewish Bible

²⁰ “‘But if a prophet presumptuously speaks a word in my name which I didn’t order him to say, or if he speaks in the name of other gods, then that prophet must die.’ ²¹ You may be wondering, ‘How are we to know if a word has not been spoken by Adonai?’ ²² When a prophet speaks in the name of Adonai, and the prediction does not come true — that is, the word is not fulfilled — then Adonai did not speak that word. The prophet who said it spoke presumptuously; you have nothing to fear from him.