Matthew 18:15

Ἐὰν δὲ ἁμαρτήσῃ εἰς σὲ ὁ ἀδελφός σου ὕπαγε καὶ ἔλεγξον αὐτὸν μεταξὺ σοῦ καὶ αὐτοῦ μόνου ἐάν σου ἀκούσῃ ἐκέρδησας τὸν ἀδελφόν σου