Matthew 18:15

If thy brother sin against thee (ean amarthsh adelpo sou). Literally, commit a sin (ingressive aorist subjunctive of amartanw). Aleph B Sahidic do not have "against thee" (ei se). Shew him his fault (elegxon). Such private reproof is hard to do, but it is the way of Christ. Thou hast gained (ekerdhsa). Aorist active indicative of kerdainw in conclusion of a third-class condition, a sort of timeless aorist, a blessed achievement already made.