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 22:13-28
Then the messenger who had gone to call Micaiah instructed him, “Behold now, with one accord the words of the prophets are favorable to the king. So please let your words be like theirs, and speak favorably.” / But Micaiah said, “As surely as the LORD lives, I will speak whatever the LORD tells me.” / When Micaiah arrived, the king asked him, “Micaiah, should we go to war against Ramoth-gilead, or should we refrain?” “Go up and triumph,” Micaiah replied, “for the LORD will deliver it into the hand of the king.” ...

Ezekiel 13:1-9
Then the word of the LORD came to me, saying, / “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 2:1-3
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. / Many will follow in their depravity, and because of them the way of truth will be defamed. / In their greed, these false teachers will exploit you with deceptive words. The longstanding verdict against them remains in force, and their destruction does not sleep.

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.

Jeremiah 14:14-16
“The prophets are prophesying lies in My name,” replied the LORD. “I did not send them or appoint them or speak to them. They are prophesying to you a false vision, a worthless divination, the futility and delusion of their own minds. / Therefore this is what the LORD says about the prophets who prophesy in My name: I did not send them, yet they say, ‘No sword or famine will touch this land.’ By sword and famine these very prophets will meet their end! / And the people to whom they prophesy will be thrown into the streets of Jerusalem because of famine and sword. There will be no one to bury them or their wives, their sons or their daughters. I will pour out their own evil upon them.

Jeremiah 23:16-22
This is what the LORD of Hosts says: “Do not listen to the words of the prophets who prophesy to you. They are filling you with false hopes. They speak visions from their own minds, not from the mouth of the LORD. / They keep saying to those who despise Me, ‘The LORD says that you will have peace,’ and to everyone who walks in the stubbornness of his own heart, ‘No harm will come to you.’ / But which of them has stood in the council of the LORD to see and hear His word? Who has given heed to His word and obeyed it? ...

Zechariah 13:2-6
And on that day, declares the LORD of Hosts, I will erase the names of the idols from the land, and they will no longer be remembered. I will also remove the prophets and the spirit of impurity from the land. / 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. / And on that day every prophet who prophesies will be ashamed of his vision, and he will not put on a hairy cloak in order to deceive. ...

Acts 13:6-12
They traveled through the whole island as far as Paphos, where they found a Jewish sorcerer and false prophet named Bar-Jesus, / an attendant of the proconsul, Sergius Paulus. The proconsul, a man of intelligence, summoned Barnabas and Saul because he wanted to hear the word of God. / But Elymas the sorcerer (for that is what his name means) opposed them and tried to turn the proconsul from the faith. ...

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.

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

Isaiah 28:7-13
These also stagger from wine and stumble from strong drink: Priests and prophets reel from strong drink and are befuddled by wine. They stumble because of strong drink, muddled in their visions and stumbling in their judgments. / For all their tables are covered with vomit; there is not a place without filth. / Whom is He trying to teach? To whom is He explaining His message? To infants just weaned from milk? To babies removed from the breast? ...

Micah 3:5-8
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.” ...

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