Sound Doctrine vs. False Teachings

The Bible teaches that we are to test all teachings (I John 4:1,6), expose those teachings that are false (Eph. 5:11), confront and rebuke the false teachers (Titus 1:9-13), and then separate from those who persist in false teaching (Rom. 16:17, Titus 3:10), lest in the end, we are disqualified for service (2 Tim. 2:20-21), or worse yet, we are identified with the false teachings and the false teachers themselves (2 John 10-11).

1 John 4:1,6 Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.

Eph. 5:11 And have no fellowship with the unfruitful works of darkness, but rather reprove them.

Titus 1:9-13 Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers. For there are many unruly and vain talkers and deceivers, specially they of the circumcision: Whose mouths must be stopped, who subvert whole houses, teaching things which they ought not, for filthy lucre's sake. One of themselves, even a prophet of their own, said, The Cretians are alway liars, evil beasts, slow bellies. This witness is true. Wherefore rebuke them sharply, that they may be sound in the faith;

Rom. 16:17 Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.

Titus 3:10 A man that is an heretick after the first and second admonition reject;

2 Tim. 2:20-21 But in a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honour, and some to dishonour. If a man therefore purge himself from these, he shall be a vessel unto honour, sanctified, and meet for the master's use, and prepared unto every good work.

2 John 10-11 If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed: For he that biddeth him God speed is partaker of his evil deeds.

2 Tim. 4:2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.

Titus 2:1 But speak thou the things which become sound doctrine: