Matthew 18:15-17
Jesus explains about problems between believers
15 Jesus said, ‘If another believer has done something wrong against you, you must go and speak to him. When you are alone with him, tell him what he has done that is wrong. He may agree with what you say. If he does, then you can call him your friend again.
16 But maybe he does not want to listen to you. Then take one or two other people with you to speak to him. Remember what the Bible says: “There must be two or three people to say certainly that another person has done something wrong. Two or three people must agree what has happened.” 17 If your friend still will not agree that he has done something wrong, then go and tell the church leaders. If he does not agree with the leaders, do not accept him as a believer. He is as bad as somebody who refuses to obey God.