Notice the bloodstains on this mans shirt. Hes a shocheta person who slaughters animals according to Jewish law. A shochet must be thoroughly trained and knowledgeable in the laws of kashrut. Here he is shown sharpening his knife. In order for an animal (other than a Œfish) to be kosher, it must be killed with a single stroke across the neck from a perfectly sharpened knife. This ensures the most painless, humane death for the animal. The shochet, therefore, has to clean and sharpen his knife after every use. The Torah also prohibits eating blood, because it represents the life of the animal. So after the animal is killed, the shochet must let the blood drain out.