Devarim 18:20-22

Orthodox Jewish Bible

²⁰ But the navi, which shall presume to speak a word Bishmi (In My Name), which I have not commanded him to speak, or that shall speak in the shem of elohim acharim, even that navi shall die.

²¹ And if thou say in thine lev, How shall we know the word which Hashem hath not spoken?

²² When a navi speaketh b’Shem Hashem, if the thing follow not, nor come to pass, that is the thing which Hashem hath not spoken, but the navi hath spoken it bezadon (in zadon [presumption, arrogance]); thou shalt not be afraid of him.