New Revised Standard Version
He must have a firm grasp of the word that is trustworthy in accordance with the teaching, so that he may be able both to preach with sound doctrine and to refute those who contradict it.

Contemporary English Version
They must stick to the true message they were taught, so their good teaching can help others and correct everyone who opposes it.

New American Bible
holding fast to the true message as taught so that he will be able both to exhort with sound doctrine and to refute opponents.

Douay-Rheims Bible
Embracing that faithful word which is according to doctrine, that he may be able to exhort in sound doctrine and to convince the gainsayers.

Embracing that faithful word which is according to doctrine, that he may be able to exhort in sound doctrine and to convince the gainsayers.

Holding.

Job 2:3 And the Lord said to Satan: Hast thou considered my servant, Job, that there is none like him in the earth, a man simple and upright, and fearing God, and avoiding evil, and still keeping his innocence? But thou hast moved me against him, that I should afflict him without cause.

Job 27:6 My justification, which I have begun to hold, I will not forsake: for my heart doth not reprehend me in all my life.

Proverbs 23:23 Buy truth, and do not sell wisdom, and instruction, and understanding.

1 Thessalonians 5:21 But prove all things: hold fast that which is good.

2 Thessalonians 2:15 Therefore, brethren, stand fast: and hold the traditions, which you have learned, whether by word or by our epistle.

2 Timothy 1:13 Hold the form of sound words which thou hast heard of me: in faith and in the love which is in Christ Jesus.

Jude 1:3 Dearly beloved, taking all care to write unto you concerning your common salvation, I was under a necessity to write unto you: to beseech you to contend earnestly for the faith once delivered to the saints.

Revelation 2:25 Yet that which you have, hold fast till I come.

Revelation 3:3,11 Have in mind therefore in what manner thou hast received and heard: and observe and do penance: If then thou shalt not watch, I will come to thee as a thief: and thou shalt not know at what hour I will come to thee. . . .

fast.

1 Timothy 1:15 A faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners, of whom I am the chief.

1 Timothy 4:9 A faithful saying and worthy of all acceptation.

1 Timothy 6:3 If any man teach otherwise and consent not to the sound words of our Lord Jesus Christ and to that doctrine which is according to godliness,

2 Timothy 2:2 And the things which thou hast heard of me by many witnesses, the same commend to faithful men who shall be fit to teach others also.

as he hath been taught.

Titus 2:1,7,8 But speak thou the things that become sound doctrine: . . .

1 Timothy 1:10 For fornicators, for them who defile themselves with mankind, for menstealers, for liars, for perjured persons, and whatever other thing is contrary to sound doctrine:

1 Timothy 6:3 If any man teach otherwise and consent not to the sound words of our Lord Jesus Christ and to that doctrine which is according to godliness,

2 Timothy 4:3 For there shall be a time when they will not endure sound doctrine but, according to their own desires, they will heap to themselves teachers having itching ears:

to convince.

Titus 1:11 Who must be reproved, who subvert whole houses, teaching things which they ought not, for filthy lucre's sake.

Acts 18:28 For with much vigour he convinced the Jews openly, shewing by the scriptures that Jesus is the Christ.

1 Corinthians 14:24 But if all prophesy, and there come in one that believeth not or an unlearned person, he is convinced of all: he is judged of all.

2 Timothy 2:25 With modesty admonishing them that resist the truth: if peradventure God may give them repentance to know the truth;