21 And if thou say in thine heart, How shall we know the word which the Lord hath not spoken? 22 When a prophet speaketh in the name of the Lord, if the thing follow not, nor come to pass, that is the thing which the Lord hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.
21 You may say to yourselves, "How can we know when a message has not been spoken by the Lord?" 22 If what a prophet proclaims in the name of the Lord does not take place or come true, that is a message the Lord has not spoken. That prophet has spoken presumptuously, so do not be alarmed.
21 And if you say in your heart, 'How may we know the word that the Lord has not spoken?'-- 22 when a prophet speaks in the name of the Lord, if the word does not come to pass or come true, that is a word that the Lord has not spoken; the prophet has spoken it presumptuously. You need not be afraid of him.
21 You may be wondering among yourselves, "How can we tell the difference, whether it was God who spoke or not?" Here's how: 22 If what the prophet spoke in God's name doesn't happen, then obviously God wasn't behind it; the prophet made it up. Forget about him.
21 And if you say in your heart, 'How shall we know the word which the Lord has not spoken?'-- 22 when a prophet speaks in the name of the Lord, if the thing does not happen or come to pass, that is the thing which the Lord has not spoken; the prophet has spoken it presumptuously; you shall not be afraid of him.
21 "But you may wonder, 'How will we know whether or not a prophecy is from the Lord ?' 22 If the prophet speaks in the Lord 's name but his prediction does not happen or come true, you will know that the Lord did not give that message. That prophet has spoken without my authority and need not be feared.
Matthew Henry's Commentary on Deuteronomy 18:21-22
Commentary on Deuteronomy 18:15-22
(Read Deuteronomy 18:15-22)
It is here promised concerning Christ, that there should come a Prophet, great above all the prophets; by whom God would make known himself and his will to the children of men, more fully and clearly than he had ever done before. He is the Light of the world, John 12:48. Woe then to those who refuse to hearken to His voice, to accept His salvation, or yield obedience to His sway! But happy they who trust in Him, and obey Him. He will lead them in the paths of safety and peace, until He brings them to the land of perfect light, purity, and happiness. Here is a caution against false prophets. It highly concerns us to have a right touchstone wherewith to try the word we hear, that we may know what that word is which the Lord has not spoken. Whatever is against the plain sense of the written word, or which gives countenance or encouragement to sin, we may be sure is not that which the Lord has spoken.