"A Chief Samurai" joke

Back in the olden days when Samurai were important, there was a powerful Japanese Emperor who needed a new Chief Samurai. So he sent out a declaration throughout the entire known world of that time that he was searching for a CHIEF Samurai. A year passed, but only 3 people applied for the very demanding position;
1. a Japanese Samurai
2. a Chinese Samurai
3. a Jewish Samurai
The emperor asked the Japanese Samurai to come in and demonstrate why he should be the chief Samurai. The Japanese Samurai opened a match box, and out popped a bumblebee. Whoosh! went his sword, and the bumblebee dropped dead on the ground.
The emperor exclaimed "That is very impressive!"
The emperor then issued the same challenge to the Chinese Samurai, to come in and demonstrate why
he should be chosen. The Chinese samurai also opened a match box and out buzzed a fly. Whoosh, Whoosh! Whoosh! Whoosh! And the fly dropped dead on the ground in four small pieces.
The emperor exclaimed: "That is VERY impressive!"
Now the emperor turned to the Jewish Samurai, and asked him to demonstrate why he should be the Chief Samurai. The Jewish Samurai also opened a match box, and out flew a gnat. His flashing sword went Whoosh! But the gnat was still alive and flying around.
The emperor, obviously disappointed, said: "Very ambitious!, but why is that gnat not dead?"
The Jewish Samurai just smiled and said: "Circumcision is not meant to kill."