Titus 3:10
A man that is a heretic, after the first and second admonition, reject him,
Romans 16:17
And I beseech you, brethren, mark those who cause dissensions and offences outside of the doctrine which ye have learned, and avoid them.
2 John 1:10
If anyone comes unto you and does not bring this doctrine, do not receive him into your house neither say unto him, Welcome:
Matthew 18:15-17
Therefore if thy brother shall sin against thee, go and reprove him between thee and him alone; if he shall hear thee, thou hast gained thy brother.
1 Corinthians 5:4-13
In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,
1 Corinthians 11:19
For it is expedient that there also be heresies among you, so that those who are proved may become manifest among you.
2 Corinthians 13:2
I told you before and foretell you, as if I were present, the second time; and being absent now, I write to those who until now have sinned and to all others that, if I come again, I will not spare,
Galatians 5:12
I even desire that those who trouble you would cut themselves off.
Galatians 5:20
idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
2 Thessalonians 3:6
Now we charge you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walks out of order, and not after the doctrine which ye received of us.
2 Thessalonians 3:14
And if anyone does not hearken unto our word by this epistle, note that one and do not join with him, that he may be ashamed.
2 Timothy 3:5
having the appearance of godliness, but denying the power thereof: from such turn away.
2 Peter 2:1
But there were also false prophets among the people, even as there shall be false teachers among you, who covertly shall bring in destructive sects and shall deny the Lord that bought them, bringing upon themselves swift destruction.