Deuteronomy 18:19-21

Amplified Bible, Classic Edition

¹⁹ And whoever will not hearken to My words which he shall speak in My name, I Myself will require it of him.

²⁰ But the prophet who presumes to speak a word in My name which I have not commanded him to speak, or who speaks in the name of other gods, that same prophet shall die.

²¹ And if you say in your [minds and] hearts, How shall we know which words the Lord has not spoken?