Matthew 24:23-24 — “Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There!’ do not believe it. For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect.
Matthew 7:15-19 — “Beware of false prophets, who come to you in sheep’s clothing, but inwardly they are ravenous wolves. You will know them by their fruits. Do men gather grapes from thornbushes or figs from thistles? Even so, every good tree bears good fruit, but a bad tree bears bad fruit. A good tree cannot bear bad fruit, nor can a bad tree bear good fruit. Every tree that does not bear good fruit is cut down and thrown into the fire.
2 Corinthians 11:13-16 — For such are false apostles, deceitful workers, transforming themselves into apostles of Christ. And no wonder! For Satan himself transforms himself into an angel of light. Therefore it is no great thing if his ministers also transform themselves into ministers of righteousness, whose end will be according to their works. I say again, let no one think me a fool. If otherwise, at least receive me as a fool, that I also may boast a little.
Deuteronomy 18:20-22 — But the prophet who presumes to speak a word in My name, which I have not commanded him to speak, or who speaks in the name of other gods, that prophet shall die.’ And if you say in your heart, ‘How shall we know the word which the Lord has not spoken?’— when a prophet speaks in the name of the Lord, if the thing does not happen or come to pass, that is the thing which the Lord has not spoken; the prophet has spoken it presumptuously; you shall not be afraid of him.
Deuteronomy 13:1-5 — “If there arises among you a prophet or a dreamer of dreams, and he gives you a sign or a wonder, and the sign or the wonder comes to pass, of which he spoke to you, saying, ‘Let us go after other gods’—which you have not known—‘and let us serve them,’ you shall not listen to the words of that prophet or that dreamer of dreams, for the Lord your God is testing you to know whether you love the Lord your God with all your heart and with all your soul. You shall walk after the Lord your God and fear Him, and keep His commandments and obey His voice; you shall serve Him and hold fast to Him. But that prophet or that dreamer of dreams shall be put to death, because he has spoken in order to turn you away from the Lord your God, who brought you out of the land of Egypt and redeemed you from the house of bondage, to entice you from the way in which the Lord your God commanded you to walk. So you shall put away the evil from your midst.
Galatians 1:6-9 — I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel, which is not another; but there are some who trouble you and want to pervert the gospel of Christ. But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.
Unless noted otherwise, all Scripture verses are from The New King James Version. 1996, ©1982. Nashville: Thomas Nelson.