Translations
He must hold firmly to the trustworthy word as taught, so that he will be able both to encourage others with sound doctrine and to refute those who oppose it.
He must hold firmly to the trustworthy word as it has been taught, so that he may be able both to exhort with sound teaching and to refute those who contradict it.
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.
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.

