2 John 1:10
If any person come unto you, and bring not this doctrine, receive him not into the house, nor say to him, Welcome.
Titus 3:10
An heretical person after a first and second admonition reject;
Galatians 1:8-9
But though even we, or an angel from heaven, preach unto you another gospel, different from that which we have preached to you, let him be an anathema.
Romans 16:17-18
Now I beseech you, brethren, keep a sharp eye over those who cause divisions and offences contrary to the doctrine ye have learned, and turn away from them.
1 Corinthians 5:11
But now I have written unto you not to associate with him, if any man, professing to be a brother, be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner, with such a one not even to eat.
2 Thessalonians 3:6
Now we command you, brethren, in the name of our Lord Jesus Christ, to withdraw yourselves from every brother who walketh disorderly, and not according to the injunction which he hath received from us.
2 Thessalonians 3:14
And if any man obey not our word by letter, mark that man, and maintain no society with him, that he may be ashamed.
1 Corinthians 16:22
If any man love not the Lord Jesus Christ, let him be Anathema, Maranatha.
2 Timothy 3:5-6
holding the form of godliness, but denying the power of it: from these men turn with aversion.
2 John 1:11
He that biddeth him welcome, takes part in his wicked works.