Deuteronomy 18:20-22

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.
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