Here is a good description..
2 Timothy 4:3-5 3 For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; 4 and they will turn their ears away from the truth, and be turned aside to fables. 5 But you be watchful in all things, endure afflictions, do the work of an evangelist, fulfill your ministry.
2 Peter 2:1-3 1 But there were also false prophets among the people, even as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Lord who bought them, and bring on themselves swift destruction. 2 And many will follow their destructive ways, because of whom the way of truth will be blasphemed. 3 By covetousness they will exploit you with deceptive words; for a long time their judgment has not been idle, and their destruction does not slumber.
1 Timothy 1: 3-7 "...remain at Ephesus that you may charge certain persons not to teach any different doctrine, nor to devote themselves to myths and endless genealogies, which promote speculations rather than the stewardship from God that is by faith. The aim of our charge is love that issues from a pure heart and a good conscience and a sincere faith. Certain persons, by swerving from these, have wandered away into vain discussion, desiring to be teachers of the law, without understanding either what they are saying or the things about which they make confident assertions."
[Paul's charge to expose unaided speculation and error in the church is done with the motive of love. While we must always teach with gentleness and respect, yet this passage affirms that the purpose of exposing bad doctrine is loving, in fact, the most loving thing a person can do for you.]
1 John 4:1-6 1 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. 2 By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God, 3 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. 4 You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world. 5 They are of the world. Therefore they speak as of the world, and the world hears them. 6 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.
2 John 1:7-11 7 For many deceivers have gone out into the world who do not confess Jesus Christ as coming in the flesh. This is a deceiver and an antichrist. 8 Look to yourselves, that we do not lose those things we worked for, but that we may receive a full reward. 9 Whoever transgresses and does not abide in the doctrine of Christ does not have God. He who abides in the doctrine of Christ has both the Father and the Son. 10 If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him; 11 for he who greets him shares in his evil deeds.
Romans 16:17-18 17 Now I urge you, brethren, note those who cause divisions and offenses, contrary to the doctrine which you learned, and avoid them. 18 For those who are such do not serve our Lord Jesus Christ, but their own belly, and by smooth words and flattering speech deceive the hearts of the simple.
2 Corinthians 11:3-15 3 But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ. 4 For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted you may well put up with it!
5 For I consider that I am not at all inferior to the most eminent apostles. 6 Even though I am untrained in speech, yet I am not in knowledge. But we have been thoroughly manifested among you in all things.
7 Did I commit sin in humbling myself that you might be exalted, because I preached the gospel of God to you free of charge? 8 I robbed other churches, taking wages from them to minister to you. 9 And when I was present with you, and in need, I was a burden to no one, for what I lacked the brethren who came from Macedonia supplied. And in everything I kept myself from being burdensome to you, and so I will keep myself. 10 As the truth of Christ is in me, no one shall stop me from this boasting in the regions of Achaia. 11 Why? Because I do not love you? God knows!
12 But what I do, I will also continue to do, that I may cut off the opportunity from those who desire an opportunity to be regarded just as we are in the things of which they boast. 13 For such are false apostles, deceitful workers, transforming themselves into apostles of Christ. 14 And no wonder! For Satan himself transforms himself into an angel of light. 15 Therefore it is no great thing if his ministers also transform themselves into ministers of righteousness, whose end will be according to their works.
Col 2:8 Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ.
Colossians 2:16-19 16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, 17 which are a shadow of things to come, but the substance is of Christ. 18 Let no one cheat you of your reward, taking delight in false humility and worship of angels, intruding into those things which he has not seen, vainly puffed up by his fleshly mind, 19 and not holding fast to the Head, from whom all the body, nourished and knit together by joints and ligaments, grows with the increase that is from God.
2 Thessalonians 2:8-12 8 And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming. 9 The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders, 10 and with all unrighteous deception among those who perish, because they did not receive the love of the truth, that they might be saved. 11 And for this reason God will send them strong delusion, that they should believe the lie, 12 that they all may be condemned who did not believe the truth but had pleasure in unrighteousness.
1 Timothy 6:3-5 3 If anyone teaches otherwise and does not consent to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which accords with godliness, 4 he is proud, knowing nothing, but is obsessed with disputes and arguments over words, from which come envy, strife, reviling, evil suspicions, 5 useless wranglings of men of corrupt minds and destitute of the truth, who suppose that godliness is a means of gain. From such withdraw yourself.
Deuteronomy 13:1-18 1 "If there arises among you a prophet or a dreamer of dreams, and he gives you a sign or a wonder, 2 "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 knownand let us serve them, 3 "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. 4 "You shall walk after the LORD your God and fear Him, and keep His commandments and obey His voice, and you shall serve Him and hold fast to Him. 5 "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.
6 "If your brother, the son of your mother, your son or your daughter, the wife of your bosom, or your friend who is as your own soul, secretly entices you, saying, Let us go and serve other gods, which you have not known, neither you nor your fathers, 7 "of the gods of the people which [are] all around you, near to you or far off from you, from [one] end of the earth to the [other] end of the earth, 8 "you shall not consent to him or listen to him, nor shall your eye pity him, nor shall you spare him or conceal him; 9 "but you shall surely kill him; your hand shall be first against him to put him to death, and afterward the hand of all the people. 10 "And you shall stone him with stones until he dies, because he sought to entice you away from the LORD your God, who brought you out of the land of Egypt, from the house of bondage. 11 "So all Israel shall hear and fear, and not again do such wickedness as this among you.
12 "If you hear someone in one of your cities, which the LORD your God gives you to dwell in, saying, 13 Corrupt men have gone out from among you and enticed the inhabitants of their city, saying, "Let us go and serve other gods" which you have not known 14 "then you shall inquire, search out, and ask diligently. And [if it is] indeed true [and] certain [that] such an abomination was committed among you, 15 "you shall surely strike the inhabitants of that city with the edge of the sword utterly destroying it, all that is in it and its livestock, with the edge of the sword. 16 "And you shall gather all its plunder into the middle of the street, and completely burn with fire the city and all its plunder, for the LORD your God. It shall be a heap forever; it shall not be built again. 17 "So none of the accursed things shall remain in your hand, that the LORD may turn from the fierceness of His anger and show you mercy, have compassion on you and multiply you, just as He swore to your fathers,18 "because you have listened to the voice of the LORD your God, to keep all His commandments which I command you today, to do [what is] right in the eyes of the LORD your God.
2 Timothy 4:3-5 3 For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; 4 and they will turn their ears away from the truth, and be turned aside to fables. 5 But you be watchful in all things, endure afflictions, do the work of an evangelist, fulfill your ministry.
2 Peter 2:1-3 1 But there were also false prophets among the people, even as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Lord who bought them, and bring on themselves swift destruction. 2 And many will follow their destructive ways, because of whom the way of truth will be blasphemed. 3 By covetousness they will exploit you with deceptive words; for a long time their judgment has not been idle, and their destruction does not slumber.
1 Timothy 1: 3-7 "...remain at Ephesus that you may charge certain persons not to teach any different doctrine, nor to devote themselves to myths and endless genealogies, which promote speculations rather than the stewardship from God that is by faith. The aim of our charge is love that issues from a pure heart and a good conscience and a sincere faith. Certain persons, by swerving from these, have wandered away into vain discussion, desiring to be teachers of the law, without understanding either what they are saying or the things about which they make confident assertions."
[Paul's charge to expose unaided speculation and error in the church is done with the motive of love. While we must always teach with gentleness and respect, yet this passage affirms that the purpose of exposing bad doctrine is loving, in fact, the most loving thing a person can do for you.]
1 John 4:1-6 1 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. 2 By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God, 3 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. 4 You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world. 5 They are of the world. Therefore they speak as of the world, and the world hears them. 6 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.
2 John 1:7-11 7 For many deceivers have gone out into the world who do not confess Jesus Christ as coming in the flesh. This is a deceiver and an antichrist. 8 Look to yourselves, that we do not lose those things we worked for, but that we may receive a full reward. 9 Whoever transgresses and does not abide in the doctrine of Christ does not have God. He who abides in the doctrine of Christ has both the Father and the Son. 10 If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him; 11 for he who greets him shares in his evil deeds.
Romans 16:17-18 17 Now I urge you, brethren, note those who cause divisions and offenses, contrary to the doctrine which you learned, and avoid them. 18 For those who are such do not serve our Lord Jesus Christ, but their own belly, and by smooth words and flattering speech deceive the hearts of the simple.
2 Corinthians 11:3-15 3 But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ. 4 For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted you may well put up with it!
5 For I consider that I am not at all inferior to the most eminent apostles. 6 Even though I am untrained in speech, yet I am not in knowledge. But we have been thoroughly manifested among you in all things.
7 Did I commit sin in humbling myself that you might be exalted, because I preached the gospel of God to you free of charge? 8 I robbed other churches, taking wages from them to minister to you. 9 And when I was present with you, and in need, I was a burden to no one, for what I lacked the brethren who came from Macedonia supplied. And in everything I kept myself from being burdensome to you, and so I will keep myself. 10 As the truth of Christ is in me, no one shall stop me from this boasting in the regions of Achaia. 11 Why? Because I do not love you? God knows!
12 But what I do, I will also continue to do, that I may cut off the opportunity from those who desire an opportunity to be regarded just as we are in the things of which they boast. 13 For such are false apostles, deceitful workers, transforming themselves into apostles of Christ. 14 And no wonder! For Satan himself transforms himself into an angel of light. 15 Therefore it is no great thing if his ministers also transform themselves into ministers of righteousness, whose end will be according to their works.
Col 2:8 Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ.
Colossians 2:16-19 16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, 17 which are a shadow of things to come, but the substance is of Christ. 18 Let no one cheat you of your reward, taking delight in false humility and worship of angels, intruding into those things which he has not seen, vainly puffed up by his fleshly mind, 19 and not holding fast to the Head, from whom all the body, nourished and knit together by joints and ligaments, grows with the increase that is from God.
2 Thessalonians 2:8-12 8 And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming. 9 The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders, 10 and with all unrighteous deception among those who perish, because they did not receive the love of the truth, that they might be saved. 11 And for this reason God will send them strong delusion, that they should believe the lie, 12 that they all may be condemned who did not believe the truth but had pleasure in unrighteousness.
1 Timothy 6:3-5 3 If anyone teaches otherwise and does not consent to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which accords with godliness, 4 he is proud, knowing nothing, but is obsessed with disputes and arguments over words, from which come envy, strife, reviling, evil suspicions, 5 useless wranglings of men of corrupt minds and destitute of the truth, who suppose that godliness is a means of gain. From such withdraw yourself.
Deuteronomy 13:1-18 1 "If there arises among you a prophet or a dreamer of dreams, and he gives you a sign or a wonder, 2 "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 knownand let us serve them, 3 "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. 4 "You shall walk after the LORD your God and fear Him, and keep His commandments and obey His voice, and you shall serve Him and hold fast to Him. 5 "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.
6 "If your brother, the son of your mother, your son or your daughter, the wife of your bosom, or your friend who is as your own soul, secretly entices you, saying, Let us go and serve other gods, which you have not known, neither you nor your fathers, 7 "of the gods of the people which [are] all around you, near to you or far off from you, from [one] end of the earth to the [other] end of the earth, 8 "you shall not consent to him or listen to him, nor shall your eye pity him, nor shall you spare him or conceal him; 9 "but you shall surely kill him; your hand shall be first against him to put him to death, and afterward the hand of all the people. 10 "And you shall stone him with stones until he dies, because he sought to entice you away from the LORD your God, who brought you out of the land of Egypt, from the house of bondage. 11 "So all Israel shall hear and fear, and not again do such wickedness as this among you.
12 "If you hear someone in one of your cities, which the LORD your God gives you to dwell in, saying, 13 Corrupt men have gone out from among you and enticed the inhabitants of their city, saying, "Let us go and serve other gods" which you have not known 14 "then you shall inquire, search out, and ask diligently. And [if it is] indeed true [and] certain [that] such an abomination was committed among you, 15 "you shall surely strike the inhabitants of that city with the edge of the sword utterly destroying it, all that is in it and its livestock, with the edge of the sword. 16 "And you shall gather all its plunder into the middle of the street, and completely burn with fire the city and all its plunder, for the LORD your God. It shall be a heap forever; it shall not be built again. 17 "So none of the accursed things shall remain in your hand, that the LORD may turn from the fierceness of His anger and show you mercy, have compassion on you and multiply you, just as He swore to your fathers,18 "because you have listened to the voice of the LORD your God, to keep all His commandments which I command you today, to do [what is] right in the eyes of the LORD your God.
