Deuteronomy 18:19-21

New International Version - UK

¹⁹ I myself will call to account anyone who does not listen to my words that the prophet speaks in my name. ²⁰ But a prophet who presumes to speak in my name anything I have not commanded, or a prophet who speaks in the name of other gods, is to be put to death.’

²¹ You may say to yourselves, ‘How can we know when a message has not been spoken by the Lord?’