Luke 17:3

3Take heedπροσέχετεto yourselvesἑαυτοῖς.Ifἐὰνshould sinἁμάρτῃtheὁbrotherἀδελφόςof youσουrebukeἐπιτίμησονhimαὐτῷ,andκαὶifἐὰνhe should repentμετανοήσῃforgiveἄφεςhimαὐτῷ·

Take heed to yourselves: If your brother should sin, rebuke him; and if he should repent, forgive him.