Zohar Mishpatim – 4
The reincarnation process was designed to give our souls opportunities to correct themselves. Those who didn’t commit serious sins have an opportunity to go through the process of ‘hell’, which cleanses them before progressing to their next, higher level.
The souls of evil people go through many different and difficult reincarnations. They experience difficult incarnations into inanimate objects, vegetables, and other living creatures. This is a ‘forced’ correction because they have lost the right of free choice. And only after their big impurities are cleansed by force, they can reincarnate into a human body, having freedom and a greater potential of cleansing and spiritual growth.
The souls of evil people suffer tremendously until they get to hell where they can be cleansed of their lower level impurities. This process usually takes about 12 months; and after it is completed, they move to a better state of life.
Souls that reincarnate into vegetables or kosher animals have a faster correction process if they are consumed as part of a meal by a person using the proper blessings. A righteous person can elevate many souls in his lifetime just by blessing and eating kosher food. In non-kosher animals and fish, the incarnated souls have greater negativity. That is why the blood of the animal must be drained totally so the soul that holds on to the body through the blood can be released without affecting the soul of the person eating it.
Kosher salt is coarse and is made that way so it will efficiently absorb the blood of the animal before it is washed and cooked.