Titus 1:9 in the King James Version
Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.
Context
8 but given to hospitality, a lover of good, sober minded, fair, holy, self-controlled,
9 holding to the faithful word which is according to the teaching, that he may be able to exhort in the sound doctrine, and to convict those who contradict him.
10 For there are also many unruly men, vain talkers and deceivers, especially those of the circumcision,