Matthew 18:16-20

But if he refuses to listen, go to him again and take one or two other people with you. ‘Every case may be proved by two or three witnesses.’ If he refuses to listen to them, tell the church. If he refuses to listen to the church, then treat him like a person who does not believe in God or like a tax collector. “I tell you the truth, the things you don’t allow on earth will be the things God does not allow. And the things you allow on earth will be the things that God allows. “Also, I tell you that if two of you on earth agree about something and pray for it, it will be done for you by my Father in heaven. This is true because if two or three people come together in my name, I am there with them.”