But if he will not hear, take with you one or two more, that ‘by the mouth of two or three witnesses every word may be established.’ (Matthew 18:16, NKJV)
Jesus said to make a personal, private attempt to gain your brother when he sins against you (Matthew 18:15). When the one who committed sin will not repent, the Lord says to follow the directive of Deuteronomy 19:15 (which He quotes), thereby giving another opportunity for both clarity and conversion to occur. The “one or two more” are brought into the conversation with the sinning brother to accomplish at least three things. First, to identify the actual presence of sin. Second, to verify or establish the accuracy of the sinner’s refusal to repent. Third, to try to persuade the sinner to repent and turn from his sin. By using this approach, the integrity of the situation is beyond dispute. An allegation of sin must not be allowed to degenerate into name-calling, and one person’s word against another person’s word. It goes without saying that credible witnesses are required to insure this integrity, since bearing false witness is also a sin (Ephesians 4:25).