Not everyone, however, will respond properly to loving, personal confrontation. The second step, if the first step fails, is to involve at least one or two other people in the discussion. … One would presumably look for those likely to prove most helpful. Impeccable integrity would seem to be a primary prerequisite so that no one’s views are misrepresented if the matter does eventually have to come before the whole church. … The primary goal, however, is to resolve an individual’s conflicts by involving as few people as possible.

Craig L. Blomberg, Matthew, Vol. 22 of The New American Commentary, edited by David S. Dockery, (Nashville: Broadman Press, 1992), 278-9.