Deuteronomy 18:19-21

Revised Standard Version Catholic Edition

¹⁹ And whoever will not give heed 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 heart, ‘How may we know the word which the Lord has not spoken?’—