1 Timothy 1:3-4
3. As I urged you when I went into Macedonia, stay there in Ephesus so that you may command certain men not to teach false doctrines any longer
4. nor to devote themselves to myths and endless genealogies. These promote controversies rather than God's work--which is by faith.
Titus 1:11
They must be silenced, because they are ruining whole households by teaching things they ought not to teach--and that for the sake of dishonest gain.
1 Timothy 6:3-5
3. If anyone teaches false doctrines and does not agree to the sound instruction of our Lord Jesus Christ and to godly teaching,
4. he is conceited and understands nothing. He has an unhealthy interest in controversies and quarrels about words that result in envy, strife, malicious talk, evil suspicions
5. and constant friction between men of corrupt mind, who have been robbed of the truth and who think that godliness is a means to financial gain.
2 Timothy 2:15-17
15. Do your best to present yourself to God as one approved, a workman who does not need to be ashamed and who correctly handles the word of truth.
16. Avoid godless chatter, because those who indulge in it will become more and more ungodly.
17. Their teaching will spread like gangrene.
Titus 2:15
These, then, are the things you should teach. Encourage and rebuke with all authority. Do not let anyone despise you.
Romans 15:4
For everything that was written in the past was written to teach us, so that through endurance and the encouragement of the Scriptures we might have hope.
2 Timothy 3:16-17
16. All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness,
17. so that the man of God may be thoroughly equipped for every good work.
But then, you DO make a good point:
Romans 16:17
I urge you, brothers, to watch out for those who cause divisions and put obstacles in your way that are contrary to the teaching you have learned. Keep away from them.
2 Thessalonians 3:6
In the name of the Lord Jesus Christ, we command you, brothers, to keep away from every brother who is idle and does not live according to the teaching you received from us.