Titus 1:9-11

9He must have a strong belief in the trustworthy message he was taught; then he will be able to encourage others with wholesome teaching and show those who oppose it where they are wrong.

10For there are many rebellious people who engage in useless talk and deceive others. This is especially true of those who insist on circumcision for salvation.

11They must be silenced, because they are turning whole families away from the truth by their false teaching. And they do it only for money.