“And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.”
King James Version (KJV)
Mt 18:17 Tell [it] unto the church. If neither effort is of avail, then report it to the church for action. This is the second instance in the New Testament use of the word "church". The first is in Mt 16:18. If he neglect to hear the church. The admonition and entreaty of the church through its elders. The church has power to admonish and to exclude. Let him be to thee as an heathen man and a publican. Have no religious fellowship with him, more than you would have with a heathen, or a publican. The publicans were usually apostate Jews. The orthodox Jews had no social intercourse with heathen or publicans.