False prophets[1]
אשר ידבר הנביא בשם יקוק ולא-יהיה הדבר ולא יבוא הוא הדבר אשר לא-דברו יקוק בזדון דברו הנביא לא תגור ממנו
That which a “prophet” says in the name of Hashem, which doesn’t come true or does not occur, that is something that Hashem did not speak; this “prophet” spoke with iniquity, do not fear him[2]
The Torah tells us that there will come a day when charlatan prophets will come and try to speak in the name of G-d. They will present miracles and wonders and predict the future. It is a capital crime to be a false prophet, and we are not to be swayed by their tricks. How can we tell if they are a charlatan, or the real deal? The Torah gives us the litmus test: if they predict something will occur, and it doesn’t, then we’ll know for sure that they are a false prophet.