heretick.

1 Corinthians 11:19
And indeed, there must be differences among you to show which of you are approved.

Galatians 5:20
idolatry and sorcery; hatred, discord, jealousy, and rage; rivalries, divisions, factions,

2 Peter 2:1
Now there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies that even deny the Master who bought them, bringing swift destruction on themselves.

after.

Matthew 18:15-17
If your brother sins against you, go and confront him privately. If he listens to you, you have won your brother over. . . .

2 Corinthians 13:2
I already warned you the second time I was with you. So now in my absence, I warn those who sinned earlier and everyone else: If I return, I will not spare anyone,

reject.

Romans 16:17
Now I urge you, brothers, to watch out for those who create divisions and obstacles that are contrary to the teaching you have learned. Turn away from them.

1 Corinthians 5:4-13
When you are gathered in the name of our Lord Jesus and I am with you in spirit, along with the power of the Lord Jesus, . . .

Galatians 5:12
As for those who are agitating you, I wish they would proceed to emasculate themselves!

2 Thessalonians 3:6, 14
Now we command you, brothers, in the name of our Lord Jesus Christ, to keep away from any brother who leads an undisciplined life that is not in keeping with the tradition you received from us. . . .

2 Timothy 3:5
having a form of godliness but denying its power. Turn away from such as these!

2 John 1:10
If anyone comes to you but does not bring this teaching, do not receive him into your home or even greet him.