And you shall remember [always] all the ways which the Lord your God has led you these forty years in the wilderness, so that He might humble you and test you, to know what was in your heart (mind), whether you would keep His commandments or not.

When a prophet speaks in the name of the Lord and the thing does not happen or come true, that is the thing which the Lord has not spoken. The prophet has spoken it presumptuously; you shall not be afraid of him.