A false prophet is someone who lies to people by pretending they have the gift of divine prophecy so that they can deceive people into thinking a certain way, believing what they want people to believe rather than what God’s word teaches us. True divine prophets warn people of things to come as God has instructed them. A false prophet may pretend to know the future, distort the word of God to lead people astray, or mislead people into believing something which is entirely not true about God and His word. For example, there have been many such false prophets who say that God told them which day the world would end.  False prophets have even convinced thousands of people that it was so and many people were deceived that followed these false teachings. Teaching God's word is a responsibility not to be taken lightly and should be done with complete accuracy when it comes to God's word. There will be and are many false prophets and false teachers in the world today. Some taking verses out of context and turning them into a teaching with a completely different meaning. Those who teach people false doctrines will be held accountable to God which is why it is so important to read the Bible and study it daily. If you know the Word of God you are less likely to be deceived by false prophets. As followers of Christ we are instructed to tell other about Jesus so it is critical that you know exactly what the Bible teaches. The Bible gives us specific directives on how to tell if someone is a false prophet. 
​Try the spirits to make sure they are of God because there are many false prophets in the world. Do not believe them.
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. I John 4:1
How you will know the Spirit of God-Every spirit that confesses that Jesus Christ who came in the flesh is of God.
​Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: I John 4:2
Every spirit that does not confess that Jesus Christ is come in the flesh is NOT of God and is the spirit of antichrist.
​And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world. I John 4:3
If you are of God you can overcome false prophets with the spirit of the antichrist because God is in you and He is greater than them.
Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world. I John 4:4
False prophets with the spirit of the antichrist speak of the world and the world hears them.
​They are of the world: therefore speak they of the world, and the world heareth them. I John 4:5
If you are of God then you know God hears you. You know the spirit of truth and the spirit of error.
We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error. I John 4:6
Love each other because love is of God. Everyone that loves is born of God and knows God.
Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God. I John 4:7
If we do not love then we do not know God because God is love.
​He that loveth not knoweth not God; for God is love. I John 4:8
God showed His great love for us when He sent His only begotten Son into the world so that we can live through Him.
​In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him. I John 4:9
This is love. God loves us so much He sent His Son as a sacrifice for our sins.
​Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins. I John 4:10
Beware of False Prophets who pretend to be of God
Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. Matt. 7:15
​You can tell who has the spirit of the antichrist-who the false prophets are by their fruits (what they produce).
Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Matt. 7:16
Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. Matt. 7:17
​ A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Matt. 7:18
Those who do not produce good fruit are cut down and thrown into the fire​.
Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Matt. 7:19
Wherefore by their fruits ye shall know them. Matt. 7:20
Only people who do the will of Jesus Christ's Father who is in heaven will enter the kingdom of heaven.
​Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. Matt. 7:21

Punishment For False Prophets 

False prophets will be thrown into the Lake of Fire:
And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever. Revelation 20:10
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And I saw the beast, and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse, and against his army. Revelation 19:19

And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone. Revelation 19:20

And the remnant were slain with the sword of him that sat upon the horse, which sword proceeded out of his mouth: and all the fowls were filled with their flesh. Revelation 19:21
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Barjesus (Elymas the sorcerer) struck temporarily blind by Apostle Paul for refusing to allow Sergius Paulus to hear the word of God:
Acts 13:6 And when they had gone through the isle unto Paphos, they found a certain sorcerer, a false prophet, a Jew, whose name was Barjesus:
Acts 13:7 Which was with the deputy of the country, Sergius Paulus, a prudent man; who called for Barnabas and Saul, and desired to hear the word of God.
Acts 13:8 But Elymas the sorcerer (for so is his name by interpretation) withstood them, seeking to turn away the deputy from the faith.
Acts 13:9 Then Saul, (who also is called Paul,) filled with the Holy Ghost, set his eyes on him.
Acts 13:10 And said, O full of all subtilty and all mischief, thou child of the devil, thou enemy of all righteousness, wilt thou not cease to pervert the right ways of the Lord?
Acts 13:11 And now, behold, the hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season. And immediately there fell on him a mist and a darkness; and he went about seeking some to lead him by the hand.
Acts 13:12 Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord.
False prophet Hananiah cast off the face of the earth and died:
And it came to pass the same year, in the beginning of the reign of Zedekiah king of Judah, in the fourth year, and in the fifth month, that Hananiah the son of Azur the prophet, which was of Gibeon, spake unto me in the house of the LORD, in the presence of the priests and of all the people, saying, Jeremiah 28:1
Thus speaketh the LORD of hosts, the God of Israel, saying, I have broken the yoke of the king of Babylon. Jeremiah 28:2
Within two full years will I bring again into this place all the vessels of the LORD's house, that Nebuchadnezzar king of Babylon took away from this place, and carried them to Babylon: Jeremiah 28:3
And I will bring again to this place Jeconiah the son of Jehoiakim king of Judah, with all the captives of Judah, that went into Babylon, saith the LORD: for I will break the yoke of the king of Babylon. Jeremiah 28:4
Then the prophet Jeremiah said unto the prophet Hananiah in the presence of the priests, and in the presence of all the people that stood in the house of the LORD, Jeremiah 28:5
Even the prophet Jeremiah said, Amen: the LORD do so: the LORD perform thy words which thou hast prophesied, to bring again the vessels of the LORD's house, and all that is carried away captive, from Babylon into this place. Jeremiah 28:6
Nevertheless hear thou now this word that I speak in thine ears, and in the ears of all the people; Jeremiah 28:7
The prophets that have been before me and before thee of old prophesied both against many countries, and against great kingdoms, of war, and of evil, and of pestilence. Jeremiah 28:8
The prophet which prophesieth of peace, when the word of the prophet shall come to pass, then shall the prophet be known, that the LORD hath truly sent him. Jeremiah 28:9
Then Hananiah the prophet took the yoke from off the prophet Jeremiah's neck, and brake it. Jeremiah 28:10
And Hananiah spake in the presence of all the people, saying, Thus saith the LORD; Even so will I break the yoke of Nebuchadnezzar king of Babylon from the neck of all nations within the space of two full years. And the prophet Jeremiah went his way. Jeremiah 28:11
Then the word of the LORD came unto Jeremiah the prophet, after that Hananiah the prophet had broken the yoke from off the neck of the prophet Jeremiah, saying, Jeremiah 28:12
Go and tell Hananiah, saying, Thus saith the LORD; Thou hast broken the yokes of wood; but thou shalt make for them yokes of iron. Jeremiah 28:13
For thus saith the LORD of hosts, the God of Israel; I have put a yoke of iron upon the neck of all these nations, that they may serve Nebuchadnezzar king of Babylon; and they shall serve him: and I have given him the beasts of the field also. Jeremiah 28:14
Then said the prophet Jeremiah unto Hananiah the prophet, Hear now, Hananiah; The LORD hath not sent thee; but thou makest this people to trust in a lie. Jeremiah 28:15
Therefore thus saith the LORD; Behold, I will cast thee from off the face of the earth: this year thou shalt die, because thou hast taught rebellion against the LORD. Jeremiah 28:16
So Hananiah the prophet died the same year in the seventh month. Jeremiah 28:17
False prophetess Jezebel’s punishment-Tribulation and death of her children
Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols. Revelation 2:20
​And I gave her space to repent of her fornication; and she repented not. Revelation 2:21
Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds. Revelation 2:22
And I will kill her children with death; and all the churches shall know that I am he which searcheth the reins and hearts: and I will give unto every one of you according to your works. Revelation 2:23

False prophets  May work miracles but are the spirits of devils

And the sixth angel poured out his vial upon the great river Euphrates; and the water thereof was dried up, that the way of the kings of the east might be prepared. Revelation 16:12
And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet. Revelation 16:13
For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty. Revelation 16:14
Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame. Revelation 16:15 ​