Titus 1:9-11

9clinging to the faithful word according to the doctrine taught, that he may be able both to encourage with sound teaching and refute gainsayers.

10For there are many and disorderly vain speakers and deceivers of people's minds, specially those of [the] circumcision,

11who must have their mouths stopped, who subvert whole houses, teaching things which ought not [to be taught] for the sake of base gain.