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If there arise among you a prophet - Any pretending to have a Divine influence, so as to be able perfectly to direct others in the way of salvation; or a dreamer of dreams - one who pretends that some deity has spoken to him in the night-season; and giveth thee a sign, אות oth, what appears to be a miraculous proof of his mission; or a wonder, מופת mopheth, some type or representation of what he wishes to bring you over to: as some have pretended to have received a consecrated image from heaven; hence the origin of the Palladium, Numa's Shields, and many of the deities among the Hindoos. But here the word seems to mean some portentous sign, such as an eclipse, which he who knew when it would take place might predict to the people who knew nothing of the matter, and thereby accredit his pretensions.

A prophet, or a dreamer of dreams - Compare Numbers 12:6. The “prophet” received his revelations by vision or direct oral communication Numbers 24:16; 2 Samuel 7:4; 2 Corinthians 12:2; “the dreamer of dreams” through the medium of a dream 1 Kings 3:5; Matthew 2:13.

Moses had cautioned against the peril that might arise from the Canaanites. Here he cautions against the rise of idolatry among themselves. It is needful for us to be well acquainted with the truths and precepts of the Bible; for we may expect to be proved by temptations of evil under the appearance of good, of error in the guise of truth; nor can any thing rightly oppose such temptations, but the plain, express testimony of God's word to the contrary. And it would be a proof of sincere affection for God, that, notwithstanding specious pretences, they should not be wrought upon the forsake God, and follow other gods to serve them.