What is the correct wording?
τότε λέγει αὐτῷ ὁ Ἰησοῦς· ἀπόστρεψον τὴν μάχαιραν σου εἰς τὸν τόπον αὐτῆς· πάντες γὰρ οἱ λαβόντες μάχαιραν ἐν μαχαίρῃ ἀπολοῦνται.
I don't speak Greek, so you'll have to take the word of W and H.
I also have no idea how well this will come across on FR.