Nay, but ye yourselves do wrong and defraud (alla humeis adikeite kai apostereite). “But (adversative alla, on the contrary) you (emphatic) do the wronging and the robbing” (active voices) “and that your brethren” (kai touto adelphous). Same idiom as at close of 1Co 6:6. The very climax of wrong-doings, to stoop to do this with one’s brethren in Christ.