Albert Barnes Commentary Titus 1:13

"This testimony is true. For which cause reprove them sharply, that they may be sound in the faith," — Titus 1:13 (ASV)

This witness is true. That is, this testimony, given long before by one of their own number, was true when the apostle wrote to Titus. The fact that this was the general character of the people was a reason why he should be on his guard when introducing men into the ministry, and in the arrangement of affairs pertaining to the church. That it was true, see proofs in Wetstein.

Wherefore rebuke them. See Barnes on 2 Timothy 4:2.

Sharply. The Greek term is apotomwv—meaning cuttingly, severely—from apotemnw, to cut off. This word is used here in the sense of severity, meaning that the reproof should be one that would be understood and would plainly show them the wickedness of such character traits.

He was not to be mealy-mouthed but was to call things by their right names and not spare their faults. When people know they are doing wrong, we should tell them so in a few words; if they do not know it, it is necessary to teach them to convince them of their error.

That they may be sound in the faith. That they may not allow the prevailing vices to corrupt their views of religion.

Note: The term “witness” in this context means “testimony.” Regarding the phrase “rebuke them sharply,” compare 2 Timothy 4:2.