Deuteronomy 18:20-22
But if any prophet dares to speak a message in My name that I have not commanded him to speak, or to speak in the name of other gods, that prophet must be put to death.” / You may ask in your heart, “How can we recognize a message that the LORD has not spoken?” / When a prophet speaks in the name of the LORD and the message does not come to pass or come true, that is a message the LORD has not spoken. The prophet has spoken presumptuously. Do not be afraid of him.

1 Kings 22:28
But Micaiah replied, “If you ever return safely, the LORD has not spoken through me.” Then he added, “Take heed, all you people!”

Ezekiel 13:2-3
“Son of man, prophesy against the prophets of Israel who are now prophesying. Tell those who prophesy out of their own imagination: Hear the word of the LORD! / This is what the Lord GOD says: Woe to the foolish prophets who follow their own spirit yet have seen nothing.

Matthew 7:15-20
Beware of false prophets. They come to you in sheep’s clothing, but inwardly they are ravenous wolves. / By their fruit you will recognize them. Are grapes gathered from thornbushes, or figs from thistles? / Likewise, every good tree bears good fruit, but a bad tree bears bad fruit. ...

2 Peter 2:1
Now there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the Master who bought them—bringing swift destruction on themselves.

1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are from God. For many false prophets have gone out into the world.

Isaiah 8:20
To the law and to the testimony! If they do not speak according to this word, they have no light of dawn.

Lamentations 3:37
Who has spoken and it came to pass, unless the Lord has ordained it?

Acts 17:11
Now the Bereans were more noble-minded than the Thessalonians, for they received the message with great eagerness and examined the Scriptures every day to see if these teachings were true.

1 Thessalonians 5:20-21
Do not treat prophecies with contempt, / but test all things. Hold fast to what is good.

2 Timothy 4:3-4
For the time will come when men will not tolerate sound doctrine, but with itching ears they will gather around themselves teachers to suit their own desires. / So they will turn their ears away from the truth and turn aside to myths.

Zechariah 13:3
And if anyone still prophesies, his father and mother who bore him will say to him, ‘You shall not remain alive, because you have spoken falsely in the name of the LORD.’ When he prophesies, his father and mother who bore him will pierce him through.

Matthew 24:11
and many false prophets will arise and deceive many.

2 Corinthians 11:13-15
For such men are false apostles, deceitful workers, masquerading as apostles of Christ. / And no wonder, for Satan himself masquerades as an angel of light. / It is not surprising, then, if his servants masquerade as servants of righteousness. Their end will correspond to their actions.

Micah 3:5-7
This is what the LORD says: “As for the prophets who lead My people astray, who proclaim peace while they chew with their teeth, but declare war against one who puts nothing in their mouths: / Therefore night will come over you without visions, and darkness without divination. The sun will set on these prophets, and the daylight will turn black over them. / Then the seers will be ashamed and the diviners will be disgraced. They will all cover their mouths because there is no answer from God.”