Deuteronomy 18

20 However, the prophet that behaves presumptuously by speaking a word in my name that I have not commanded him to speak, and who speaks in the name of other gods, then that prophet shall die.’ 21 And if you say to yourself,*Literally "in your heart" ‘How can we know the word that Yahweh has not spoken to him?’ 22 Whenever what the prophet spoke in the name of Yahweh, the thing does not take place and does not come about, that is the thing that Yahweh has not spoken to him.*Or "that Yahweh has not spoken it" Presumptuously the prophet spoke it; you shall not fear that*Hebrew "the" prophet."