Deuteronomy 5:28

5:28 When the Lord heard you speaking to me, he said to me, “I have heard what these people have said to you – they have spoken well.

Deuteronomy 18:20

18:20 “But if any prophet presumes to speak anything in my name that I have not authorized him to speak, or speaks in the name of other gods, that prophet must die.

Deuteronomy 18:22

18:22 whenever a prophet speaks in my name and the prediction is not fulfilled, then I have not spoken it; the prophet has presumed to speak it, so you need not fear him.”