Deuteronomy 13:3 - Matthew Poole's English Annotations on the Holy Bible

Thou shalt not hearken unto the words of that prophet; not receive his doctrine, though the sign come to pass. For although when such a sign or wonder foretold did not follow or come to pass, it was a sign of a false prophet, as is said, Deuteronomy 18:22, yet when it did come to pass, it was no sufficient or infallible sign of a true one, especially in such a case when he brings in new gods. The reason of the difference is, because many causes must concur to make a thing good and true, but any one failure is sufficient to make a thing bad or false. And particularly there are many signs, yea, such as men may think to be wonders, which may be wrought by evil spirits, God so permitting it for divers wise and just reasons, not only for the trial of the good, as it here follows, but also for the punishment of ungodly men, who would not receive Divine truths, though attested by many evident and unquestionable miracles, and therefore are most justly exposed to these temptations to believe lies. Proveth you, i.e. trieth your faith, and love, and obedience, examineth your sincerity by your constancy. See Matthew 24:24 2 Thessalonians 2:11 Revelation 13:14. See Poole on "Genesis 21:1"; See Poole on "Deuteronomy 8:2,7". To know; that he may know it, to wit, judicially, or in a public manner, so as both you and others may know and see it, that so the justice of his judgments upon you may be more evident and glorious.