Parallel
Titus 1:9
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
Holding fast the faithful word as he hath been taught (note: Or, in teaching), that he may be able by sound doctrine both to exhort and to convince the gainsayers.
He must hold firmly to the faithful word as it was taught, so that he can encourage others by sound teaching and refute those who contradict it.