Matthew 18:16-18

16But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. 17And if he shall neglect to hear them, tell it to the church: but if he shall neglect to hear the church, let him be to thee as an heathen and a tax collector. 18Verily I say to you, Whatever ye shall bind on earth shall be bound in heaven: and whatever ye shall loose on earth shall be loosed in heaven.