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1 John 4:1-3
Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world. By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God, and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world.
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1 John 4:5-6
They are of the world. Therefore they speak as of the world, and the world hears them. We are of God. He who knows God hears us; he who is not of God does not hear us. By this we know the spirit of truth and the spirit of error.
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Matthew 7:15-23
"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. Therefore by their fruits you will know them. "Not everyone who says to Me, "Lord, Lord," shall enter the kingdom of heaven, but he who does the will of My Father in heaven. Many will say to Me in that day, "Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?" And then I will declare to them, "I never knew you; depart from Me, you who practice lawlessness!"
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2 Corinthians 11:13-15
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.
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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.
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Matthew 24:24-25
For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect. See, I have told you beforehand.
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Acts 20:29-30
For I know this, that after my departure savage wolves will come in among you, not sparing the flock. Also from among yourselves men will rise up, speaking perverse things, to draw away the disciples after themselves.
For more scripture references, please see Bible verses for Spirits, Testing
Resources
Testing the Spirits (Part 1)
Sermon by Martin G. CollinsThe Apostle John exhorts us to test and discern the spirits, judging between the true and the false, using the scripture as the steady standard of truth.
Testing the Spirits (Part 2)
Sermon by Martin G. CollinsI John, addresses a congregation grounded in the truth but vexed from within by a number of anti-Christian teachings, including Docetism and Gnosticism.
The Gift of Discerning Spirits
'Ready Answer' by David F. MaasGod gives the ability to determine the source of a spiritual manifestation. However, this gift depends on a thorough knowledge and understanding of God's Word.
Discerning Spirits and Discerning the Body
Sermon by Martin G. CollinsBecause of the culture of deception fostered by Satan and his children, we must develop discernment to tell the difference between truth and falsehood.

Discern and Distinguish Between Spirits
Sermon by Martin G. CollinsInspiration and doctrine were meant to be complementary rather than adversarial. Many believe they have found new truth when they have recycled old heresies.
Disinterestedness: Our Spiritual Iron Dome
Sermon by David F. MaasSolomon used self-reflexiveness to detach himself and remain disinterested to objectively describe the consequences of an array of life's experiences.
Powerful Effects of the Holy Spirit
Sermon by Martin G. CollinsWe are intrigued by supernatural power, and many seek to display it. Yet the Scriptures show the activity of the Holy Spirit in ways that are commonly missed.
False Gospels
Sermon by Richard T. RitenbaughA major clue for discerning false gospels is that any teaching attempting to change the nature of God or Christ or their doctrines is anti-Christ and false.
For more resources, please see the library topic for Spirits, Testing