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1 Corinthians 11:18-19
For first of all, when you come together as a church, I hear that there are divisions among you, and in part I believe it. For there must also be factions among you, that those who are approved may be recognized among you.
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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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Jude 1:3-5
Beloved, while I was very diligent to write to you concerning our common salvation, I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the saints. For certain men have crept in unnoticed, who long ago were marked out for this condemnation, ungodly men, who turn the grace of our God into lewdness and deny the only Lord God and our Lord Jesus Christ. But I want to remind you, though you once knew this, that the Lord, having saved the people out of the land of Egypt, afterward destroyed those who did not believe.
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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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Ephesians 4:14
that we should no longer be children, tossed to and fro and carried about with every wind of doctrine, by the trickery of men, in the cunning craftiness of deceitful plotting,
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Philippians 2:3-4
Let nothing be done through selfish ambition or conceit, but in lowliness of mind let each esteem others better than himself. Let each of you look out not only for his own interests, but also for the interests of others.
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1 John 2:18-23
Little children, it is the last hour; and as you have heard that the Antichrist is coming, even now many antichrists have come, by which we know that it is the last hour. They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out that they might be made manifest, that none of them were of us. But you have an anointing from the Holy One, and you know all things. I have not written to you because you do not know the truth, but because you know it, and that no lie is of the truth. Who is a liar but he who denies that Jesus is the Christ? He is antichrist who denies the Father and the Son. Whoever denies the Son does not have the Father either; he who acknowledges the Son has the Father also.
For more scripture references, please see Bible verses for Church Problems
Resources
Will the Church of God Be Thrown Down? (Part Two)
CGG Weekly by David C. GrabbeThe church has Christ as the Chief Cornerstone. As long as there is a church, there will also be at least one living stone upon another.
Is There a True Church?
Sermon/Bible Study by John W. RitenbaughGod's true church cannot be found without revelation nor can one join the organization; God calls and places each member in its appropriate place in the Body.
What Is the Church's Work Today (Part Two)
Feast of Tabernacles Sermon by John W. RitenbaughThe easiest part of God's work is preaching the gospel to the world. Much more demanding is the feeding of the flock, producing life-changing faith.
Letters to Seven Churches (Part Ten): The Church
Sermon by Richard T. RitenbaughUps and downs, blessings and trials, have characterized every era of the church. God's people are always battling something negative between the brief highs.
What Is the Church's Work Today (Part Three)
Feast of Tabernacles Sermon by John W. RitenbaughThe primary focus at this time is the repair of the faith once delivered that has seriously deteriorated because of heresy, apostasy, and Laodiceanism.

The Mystery of the Church
Sermon by Richard T. RitenbaughGod desires to know whether the spiritual remnants will choose His teaching or assimilating into the world, biting and devouring one another.

Titus (Part Four): Traits of a Healthy Church
Sermon by Richard T. RitenbaughTitus 2 gives specific instructions to senior members of the congregation, followed by instructions to the youth, explaining their responsibilities.
Autoimmunity in the Body of Christ
CGG Weekly by David C. GrabbeMisidentifying parts of the Body of Christ as enemies, or even being highly suspicious of them, causes pain and inefficiency throughout the whole Body.
For more resources, please see the library topic for Church Problems