Matthew 18:16-18

16But if he won’t listen, take one or two others with you, so that by the testimony of two or three witnesses every fact may be established.

17If he doesn’t pay attention to them, tell the church. If he doesn’t pay attention even to the church, let him be like a Gentile and a tax collector to you.

18Truly I tell you, whatever you bind on earth will have been bound in heaven, and whatever you loose on earth will have been loosed in heaven.