Moses
Deuteronomy 13:1ESV·traditional attribution

“If a prophet or a dreamer of dreams arises among you and gives you a sign or a wonder,

John Calvin Reformed @genevareformer

After having restrained the Israelites from the strange delusions of the Gentiles, Moses now forbids them from being too credulous if false teachers should arise from among themselves, and warns them diligently to beware of all novel inventions, and not to turn aside in the very least degree from the Law, at the instigation of any one.

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

If there arise among you a prophet,.... A false prophet, a lying prophet, as the Targum of Jonathan; one that pretends to be a true prophet, and to be sent of God, and to come from him with a message from him, a new revelation or doctrine, or in his name, to foretell things to come; the former is chiefly meant.