Verse

Deuteronomy 18:20

A church father on this verse
We can be prepared to find some prophet even of impiety—and perhaps not just one but several—who will tell us of a word of the Lord, which the Lord has not at all commanded, or a "word of wisdom" which has nothing whatever to do with wisdom. His purpose is to slay us by the word of his mouth.
Origen of Alexandria, 3th c. — EXHORTATION TO MARTYRDOM 8
Original

20But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.

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In context

18I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him.

19And it shall come to pass, that whosoever will not hearken unto my words which he shall speak in my name, I will require it of him.

Deuteronomy 18:20

21And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?

22When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.

Read all of Deuteronomy 18