The Egyptian left the heart in the body. They did this as a ritual so that the heart would be with them in the afterlife. In the afterlife, the heart was weighed against a feather. This was done in order to see if the Egyptian was good or bad during the first life. If the heart weighed less than the feather, that meant the Egyptian was good. If the heart was heaver that the feather than that meant they were bad in the first life.