Matthew 18:15-16 – But do it privately
“If your brother sins against you, go to him and show him his fault. But do it privately, just between yourselves. If he listens to you, you have won your brother back. But if he will not listen to you, take one or two other persons with you, so that ‘every accusation may be upheld by the testimony of two or more witnesses,’ as the Scripture says…”