Contemporary English Version
This surely is a true saying. And you should be hard on such people, so you can help them grow stronger in their faith.

New American Bible
That testimony is true. Therefore, admonish them sharply, so that they may be sound in the faith,

Douay-Rheims Bible
This testimony is true. Wherefore, rebuke them sharply, that they may be sound in the faith:

This testimony is true. Wherefore, rebuke them sharply, that they may be sound in the faith:

rebuke.

Titus 2:15 These things speak and exhort and rebuke with all authority. Let no man despise thee.

Proverbs 27:5 Open rebuke is better than hidden love.

2 Corinthians 13:10 Therefore I write these things, being absent, that, being present, I may not deal more severely, according to the power which the Lord hath given me unto edification and not unto destruction.

1 Timothy 5:20 Them that sin reprove before all that the rest also may have fear.

2 Timothy 4:2 Preach the word: be instant in season, out of season: reprove, entreat, rebuke in all patience and doctrine.

that.

Titus 2:2 That the aged men be sober, chaste, prudent, sound in faith, in love, in patience.

Leviticus 19:17 Thou shalt not hate thy brother in thy heart: But reprove him openly, lest thou incur sin through him.

Psalm 119:80 Let my heart be undefiled in thy justifications, that I may not be confounded.

Psalm 141:5 The just man shall correct me in mercy, and shall reprove me: but let not the oil of the sinner fatten my head. For my prayer shall still be against the things with which they are well pleased:

2 Corinthians 7:8-12 For although I made you sorrowful by my epistle, I do not repent. And if I did repent, seeing that the same epistle (although but for a time) did make you sorrowful, . . .

1 Timothy 4:6 These things proposing to the brethren, thou shalt be a good minister of Christ Jesus, nourished up in the words of faith and of the good doctrine which thou hast attained unto.