Deuteronomy 18:21
And if you say in your heart, How shall we know the word which the Yahuah has not spoken?
ā The Restored Word Bible
Context
19 And it shall come to pass, whosoever will not hearken unto my words which he shall speak in my name, I will require of him.
20 But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
21 And if you say in your heart, How shall we know the word which the Yahuah has not spoken?
22 When a prophet speaketh in the name of the Yahuah, if the thing follow not, nor come to pass, that the thing which the Yahuah has not spoken, the prophet has spoken it presumptuously: you shall not be afraid of him.