Deuteronomy 13:2

To pass. The completion of a prophecy does not always prove, that the person who uttered it was a true prophet. Chance, a knowledge of natural causes, &c., may enable an impostor sometimes to hit upon the truth. God may also, for reasons known to himself, declare what will come to pass, by the mouth of a false prophet, or of a wicked man, as he did by Balaam and Caiphas. Judas wrought miracles before his apostacy. (Calmet) --- Yet if any who had been so highly favoured, should attempt to enforce by their preceding miracles, any false doctrine, let him be anathema, Galatians i. 8. --- Not. The Hebrews had inconvertible proofs of the existence of one God. They could not therefore acknowledge any other. (Haydock) --- Novelty in religion is a mark of idolatry or of heresy. (Worthington)