Moses
Deuteronomy 13:5BSB·traditional attribution

Such a prophet or dreamer must be put to death, because he has advocated rebellion against the LORD your God, who brought you out of the land of Egypt and redeemed you from the house of slavery; he has tried to turn you from the way in which the LORD your God has commanded you to walk. So you must purge the evil from among you.

John Calvin Reformed @genevareformer

5. And that prophet. Since the ministers of Satan deceive men by their plausible exterior, when they vaunt themselves to be the prophets of God, Moses had already admonished them, that all. teachers were not to be listened to indifferently, but that the true were to be distinguished from the false, and that, after judgment had, those should obtain credit who deserved it.

Matthew Henry Presbyterian @wholebiblehenry

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...

Commenting on Deuteronomy 13:1-5

John Gill Reformed Baptist @doctorgill

And that prophet, or that dreamer of dreams, shall be put to death,.... Which death, according to the Targum of Jonathan, was to be killed with the sword: because he hath spoken to turn you away from the Lord your God; or "spoken revolt against the Lord" (l), high treason against him, delivering out doctrine that tends to cause his subjects to rebel against him...