For there are many who are insubordinate, empty talkers and deceivers, especially those of the circumcision party. They must be silenced, since they are upsetting whole families by teaching for shameful gain what they ought not to teach. (Titus 1:10-11)
But avoid foolish controversies, genealogies, dissensions, and quarrels about the law, for they are unprofitable and worthless. (Titus 3:8)
For many deceivers have gone out into the world, those who do not confess the coming of Jesus Christ in the flesh. Such a one is the deceiver and the antichrist. . . . If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greeting, for whoever greets him takes part in his wicked works. (2 John 7, 10-11)