I think you're looking for this passage in Matthew, folks:

"If your brother does something wrong, go and have it out with him alone, between your two selves. If he listens to you, you have won back your brother. If he does not listen, take one or two others along with you: the evidence of two or three witnesses is required to sustain any charge. But if he refuses to listen to these, report it to the community; and if he refuses to listen to the community, treat him like a pagan or a tax collector.

I tell you solemnly, whatsoever you bind on earth will be considered bound in heaven; whatever you loose on earth shall be considered loosed in heaven."

(Matthew 18:15-18, Jerusalem Bible, Reader's Edition)