πάντες γὰρ οἱ λαβόντες μάχαιραν ἐν μαχαίρῃ ἀπολοῦνται → all they that take the sword shall perish with the sword
adj.
P. ἀξιόπιστος, Ar. and P. ἀξιόχρεως (also Eur. but rare V.).
