Deuteronomy 18:19 YLT

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? --