Mateus 18

15 "If your brother sins against you, go and show him his fault between yourself and him alone. If he listens to you, you have won over your brother.

16 If he does not listen to you, take along with you one or two more, that at the mouth of two witnesses, or three, every word may be confirmed.

17 If he refuses to hear them, tell it to the church. If he refuses to hear the church, let him be to you as a Gentile or a tax collector.