Moreover if your brother sins against you, go and tell him his fault between you and him alone. If he hears you, you have gained your brother. (Matthew 18:15, NKJV)
The sin under consideration in this verse is personal in nature (“against you”). Its private nature is necessarily implied in the instruction Jesus gives, “go and tell him his fault between you and him alone.” The sin is not generally known, and is to be privately discussed. Christ’s command also implies the one who sinned may not even know he has sinned against his brother, since Jesus said to “tell him his fault…” The manner of this initial discussion is informative and persuasive. That is, the sinner needs to “hear” that he has sinned, as well as how to remedy it through repentance (Acts 8:22). Damage is done when private sins are made public. Gossip, backbiting and rumor-mongering may begin from a failure to keep private sins, private. Remember, the goal is to “seek the one that is straying,” not slay him because he has wandered from the Shepherd (Matt. 18:12).