Deuteronomy 18

20 Only, the prophet who presumes to speak a word in My Name, which I have not commanded him to speak, and who speaks in the name of other gods, indeed, that prophet has died. 21 And when you say in your heart, How do we know the word which YHWH has not spoken? 22 That which the prophet speaks in the Name of YHWH, and the thing is not, and does not come—it [is] the word which YHWH has not spoken; the prophet has spoken it in presumption; you are not afraid of him."