New Revised Standard Version
If a prophet speaks in the name of the LORD but the thing does not take place or prove true, it is a word that the LORD has not spoken. The prophet has spoken it presumptuously; do not be frightened by it.

Contemporary English Version
You will know, because if the LORD says something will happen, it will happen. And if it doesn't, you will know that the prophet was falsely claiming to speak for the LORD. Don't be afraid of any prophet whose message doesn't come from the LORD.

New American Bible
if a prophet speaks in the name of the LORD but the word does not come true, it is a word the LORD did not speak. The prophet has spoken it presumptuously; do not fear him.

Douay-Rheims Bible
Thou shalt have this sign: Whatsoever that same prophet foretelleth in the name of the Lord, and it cometh not to pass: that thing the Lord hath not spoken, but the prophet hath forged it by the pride of his mind: and therefore thou shalt not fear him.

Thou shalt have this sign: Whatsoever that same prophet foretelleth in the name of the Lord, and it cometh not to pass: that thing the Lord hath not spoken, but the prophet hath forged it by the pride of his mind: and therefore thou shalt not fear him.

speaketh

Isaiah 41:22 Let them come, and tell us all things that are to come: tell us the former things what they were: and we will set our heart upon them and shall know the latter end of them, and tell us the things that are to come.

Jeremiah 28:1-14 And it came to pass in that year, in the beginning of the reign of Sedecias king of Juda, in the fourth year, in the fifth month, that Hananias the son of Azur, a prophet of Gabaon spoke to me, in the house of the Lord before the priests, and all the people, saying: . . .

if the thing

Deuteronomy 13:2 And that come to pass which he spoke, and he say to thee: Let us go and follow strange gods, which thou knowest not, and let us serve them:

2 Kings 20:1 In those days Ezechias was sick unto death: and Isaias, the son of Amos, the prophet, came and said to him: Thus saith the Lord God: Give charge concerning thy house, for thou shalt die, and not llve.

Jonah 3:4 And Jonah arose, and went to Ninive, according to the word of the Lord: now Ninive was a great city of three days' journey.

Jonah 4:2 And Jonah was exceedingly troubled, and was angry:

Zechariah 1:5,6 Your fathers, where are they? and the prophets, shall they live always? . . .

presumptuously

Deuteronomy 18:20 But the prophet, who being corrupted with pride, shall speak in my name things that I did not command him to say, or in the name of strange gods, shall be slain.

Jeremiah 28:15-17 And Jeremiah the prophet said to Hananias the prophet: Hear now, Hananias: the Lord hath not sent thee, and thou hast made this people to trust in a lie. . . .

shall not

Proverbs 26:2 As a bird flying to other places, and a sparrow going here or there: so a curse uttered without cause shall come upon a man.