In Context

16 according to all that thou didst ask from Jehovah thy God, in Horeb, in the day of the assembly, saying, Let me not add to hear the voice of Jehovah my God, and this great fire let me not see any more, and I die not;

17 and Jehovah saith unto me, They have done well that they have spoken;

18 a prophet I raise up to them, out of the midst of their brethren, like to thee; and I have given my words in his mouth, and he hath spoken unto them all that which I command him;

19 and it hath been — the man who doth not hearken unto My words which he doth speak in My name, I require it of him.

20 Only, the prophet who presumeth to speak a word in My name — that which I have not commanded him to speak — and who speaketh in the name of other gods — even that prophet hath died.

21 And when thou sayest in thy heart, How do we know the word which Jehovah hath not spoken? —

Deuteronomy 18:19 in Other Translations