YOU SAID:

A sword won't die unless it kills

INTO JAPANESE

剣は殺さなければ死なない

BACK INTO ENGLISH

If you don't kill the sword, you won't die

INTO JAPANESE

剣を斬らなければ死なない

BACK INTO ENGLISH

If you don't cut the sword, you won't die

INTO JAPANESE

刀を切らなければ死なない

BACK INTO ENGLISH

If you don't cut the sword, you won't die