Titus 1:9-11

9He must hold firmly to the trustworthy message as it has been taught, so that he can encourage others by sound doctrine and refute those who oppose it. 10For there are many rebellious people, full of meaningless talk and deception, especially those of the circumcision group. 11They must be silenced, because they are disrupting whole households by teaching things they ought not to teach—and that for the sake of dishonest gain.