Parallel
Deuteronomy 18:22
Brenton's English Septuagint · Berean Standard Bible
Whatsoever words that prophet shall speak in the name of the Lord, and they shall not come true, and not come to pass, this [is] the thing which the Lord has not spoken; that prophet has spoken wickedly: ye shall not spare him.
When a prophet speaks in the name of the LORD and the message does not come to pass or come true, that is a message the LORD has not spoken. The prophet has spoken presumptuously. Do not be afraid of him.