Conflicts between brethren are very personal matters to be handled as quietly as possible. The broad principle stated in Titus 3:2 should be honored, “Speak evil of no man”. If we are to “love our brother as ourselves,” Matthew 12:31, we surely want to be extremely careful in resolving any problems that should arise among us.
Thus, if we have meticulously followed the steps in the context of this verse, then we may go to our local church. This is the church where both the offended person and the offender regularly worship together. If both persons do not attend the same church, then it is not a church matter.
Approaching the church about a problem should be an extremely rare occurrence. In our hearts, mercy should reign (James 2:13). We should be ready to let go of as many little issues as possible. “If it is possible, as far as it depends on you, live at peace with everyone,” Romans 12:18 (NIV).
If a serious scriptural principle is violated, only then should the church become involved. Most problems between brethren are found to be the result of human misunderstandings. The first step of Matthew 18 is to go to him or her alone and clear it up.
If the issue or situation is still unresolved, then surely bringing a third party, who has no prior knowledge of the circumstance, will clear things up.
At any rate, there is only one church that would be appropriate to this verse, and that is where the one with the problem and the offender regularly attend.