DEU 18:22

22 [The answer is that] when someone speaks a message [about what will happen in the future], a message that he says was revealed by Yahweh, if what he says does not happen, [you will know that] the message did not come from Yahweh. That person has wrongly claimed that it was revealed to him by Yahweh. So you do not need to be afraid of [anything that] he [says].”