Deuteronomy 13:1

The first case. If a prophet, or one who had dreams, should rise up to summon to the worship of other gods, with signs and wonders which came to pass, the Israelites were not to hearken to his words, but to put him to death. The introduction of חלום חלם, "a dreamer of dreams," along with the prophet, answers the two media of divine revelation, the vision and the dream, by which, according to Num 12:6, God made known His will. With regard to the signs and wonders (mopheth, see at Exo 4:21) with which such a prophet might seek to accredit his higher mission, it is taken for granted that they come to pass (בּוא); yet for all that, the Israelites were to give no heed to such a prophet, to walk after other gods. It follows from this, that the person had not been sent by God, but as a false prophet, and that the signs and wonders which he gave were not wonders effected by God, but σημεῖα καὶ τέρατα ψεύδους ("lying sings and wonders," Th2 2:9); i.e., not merely seeming miracles, but miracles wrought in the power of the wicked one, Satan, the possibility and reality of which even Christ attests (Mat 24:24). - The word לאמר, saying, is dependent upon the principal verb of the sentence: "if a prophet rise up...saying, We will go after other gods."

Here is, I. A very strange supposition, Deu 13:1, Deu 13:2. 1. It is strange that there should arise any among themselves, especially any pretending to vision and prophecy, who should instigate them to go and serve other gods. Was it possible that any who had so much knowledge of the methods of divine revelation as to be able to personate a prophet should yet have so little knowledge of the divine nature and will as to go himself and entice his neighbours after other gods? Could an Israelite ever be guilty of such impiety? Could a man of sense ever be guilty of such absurdity? We see it in our own day, and therefore may think it the less strange; multitudes that profess both learning and religion yet exciting both themselves and others, not only to worship God by images, but to give divine honour to saints and angels, which is no better than going after other gods to serve them; such is the power of strong delusions. 2. It is yet more strange that the sign or wonder given for the confirmation of this false doctrine should come to pass. Can it be thought that God himself should give any countenance to such a vile proceeding? Did ever a false prophet work a true miracle? It is only supposed here for two reasons: - (1.) To strengthen the caution here given against hearkening to such a one. "Though it were possible that he should work a true miracle, yet you must not believe him if he tell you that you must serve other gods, for the divine law against that is certainly perpetual and unalterable." The supposition is like that in Gal 1:8, If we, or an angel from heaven, preach any other gospel to you - which does not prove it possible that an angel should preach another gospel, but strongly expresses the certainty and perpetuity of that which we have received. So here, (2.) I…

13:1-18 Prophets who tried to lead Israel away from the one true God were guilty of treason, which carried the death penalty. No other religion insisted on exclusive worship of their national gods; consequently, such harsh penalties for the worship of competing deities were unknown elsewhere in the ancient Near East. 13:1 God performed signs and miracles to induce amazement and faith in those who witnessed them (see 6:22). False prophets and magicians were able to replicate these feats to a degree and thus sometimes led God’s people astray (see Exod 7:11, 22; 8:7).