Matthew 18:16-18

16But if he will not hear, take with you one or two more, that ‘by the mouth of two or three witnesses every word may be established.’

17And if he refuses to hear them, tell it to the church. But if he refuses even to hear the church, let him be to you like a heathen and a tax collector.

18“Assuredly, I say to you, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.