If your brother sins against you, go and show him his fault, just between the two of you. If he listens to you, you have won your brother over. (Matthew 18:15) (NIV)

So watch yourselves. If your brother sins, rebuke him, and if he repents, forgive him. If he sins against you seven times in a day, and seven times comes back …

(Some manuscripts read: 'If your brother sins, go and show him his fault...')

Do not judge according to appearance, but judge with righteous judgment. (John 7:24) (NASB)