1st Timothy 6

2Those who have believing masters must not be disrespectful on the ground that they are brothers; rather they must serve all the better since those who benefit by their good service are believers and beloved.

Teach and urge these things.  3If anyone teaches a different doctrine and does not agree with the sound words of our Lord Jesus Christ and the teaching that accords with godliness,  4he is puffed up with conceit and understands nothing. He has an unhealthy craving for controversy and for quarrels about words, which produce envy, dissension, slander, evil suspicions,  5and constant friction among people who are depraved in mind and deprived of the truth, imagining that godliness is a means of gain.  

2nd Peter 2

1But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them, bringing upon themselves swift destruction.  2And many will follow their sensuality, and because of them the way of truth will be blasphemed.  3And in their greed they will exploit you with false words. Their condemnation from long ago is not idle, and their destruction is not asleep.